US20240043623A1 - Curable silicone composition and cured product therefrom - Google Patents
Curable silicone composition and cured product therefrom Download PDFInfo
- Publication number
- US20240043623A1 US20240043623A1 US18/013,882 US202118013882A US2024043623A1 US 20240043623 A1 US20240043623 A1 US 20240043623A1 US 202118013882 A US202118013882 A US 202118013882A US 2024043623 A1 US2024043623 A1 US 2024043623A1
- Authority
- US
- United States
- Prior art keywords
- component
- sio
- cured product
- group
- curable silicone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 157
- 229920001296 polysiloxane Polymers 0.000 title claims abstract description 114
- 229920005989 resin Polymers 0.000 claims abstract description 53
- 239000011347 resin Substances 0.000 claims abstract description 53
- 125000000524 functional group Chemical group 0.000 claims abstract description 38
- 239000011203 carbon fibre reinforced carbon Substances 0.000 claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 239000004065 semiconductor Substances 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 19
- -1 siloxane unit Chemical group 0.000 claims description 53
- 125000003342 alkenyl group Chemical group 0.000 claims description 39
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 27
- 125000004432 carbon atom Chemical group C* 0.000 claims description 27
- 229910020485 SiO4/2 Inorganic materials 0.000 claims description 25
- 229920006136 organohydrogenpolysiloxane Polymers 0.000 claims description 25
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 21
- 238000006459 hydrosilylation reaction Methods 0.000 claims description 17
- 229910020388 SiO1/2 Inorganic materials 0.000 claims description 16
- 125000000217 alkyl group Chemical group 0.000 claims description 16
- 150000002430 hydrocarbons Chemical group 0.000 claims description 16
- 125000000962 organic group Chemical group 0.000 claims description 16
- 238000005227 gel permeation chromatography Methods 0.000 claims description 12
- 239000007809 chemical reaction catalyst Substances 0.000 claims description 11
- 125000003545 alkoxy group Chemical group 0.000 claims description 10
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 9
- 239000002904 solvent Substances 0.000 claims description 9
- 229910020447 SiO2/2 Inorganic materials 0.000 claims description 7
- 229910020487 SiO3/2 Inorganic materials 0.000 claims description 7
- 239000012767 functional filler Substances 0.000 claims description 5
- 229920005645 diorganopolysiloxane polymer Polymers 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 abstract description 18
- 239000000853 adhesive Substances 0.000 abstract description 9
- 238000001723 curing Methods 0.000 description 72
- 239000000463 material Substances 0.000 description 31
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 24
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 24
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 23
- 239000003054 catalyst Substances 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 14
- 125000003118 aryl group Chemical group 0.000 description 13
- 238000000034 method Methods 0.000 description 13
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 11
- 229910052697 platinum Inorganic materials 0.000 description 11
- 238000007789 sealing Methods 0.000 description 10
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 239000011231 conductive filler Substances 0.000 description 8
- 239000000945 filler Substances 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 8
- 239000012763 reinforcing filler Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 239000011859 microparticle Substances 0.000 description 6
- 150000001451 organic peroxides Chemical class 0.000 description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 6
- HRGDZIGMBDGFTC-UHFFFAOYSA-N platinum(2+) Chemical compound [Pt+2] HRGDZIGMBDGFTC-UHFFFAOYSA-N 0.000 description 6
- 229920012287 polyphenylene sulfone Polymers 0.000 description 6
- 239000012463 white pigment Substances 0.000 description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 5
- 238000004040 coloring Methods 0.000 description 5
- 239000004205 dimethyl polysiloxane Substances 0.000 description 5
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- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
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- 229910052710 silicon Inorganic materials 0.000 description 5
- 229920002050 silicone resin Polymers 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
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- 238000001579 optical reflectometry Methods 0.000 description 4
- 239000012766 organic filler Substances 0.000 description 4
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- 239000011787 zinc oxide Substances 0.000 description 4
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- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 125000003710 aryl alkyl group Chemical group 0.000 description 3
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 3
- 238000010894 electron beam technology Methods 0.000 description 3
- 239000008393 encapsulating agent Substances 0.000 description 3
- BITPLIXHRASDQB-UHFFFAOYSA-N ethenyl-[ethenyl(dimethyl)silyl]oxy-dimethylsilane Chemical compound C=C[Si](C)(C)O[Si](C)(C)C=C BITPLIXHRASDQB-UHFFFAOYSA-N 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 125000006038 hexenyl group Chemical group 0.000 description 3
- 239000012943 hotmelt Substances 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 3
- 229910003475 inorganic filler Inorganic materials 0.000 description 3
- 230000001678 irradiating effect Effects 0.000 description 3
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- 239000000243 solution Substances 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- KLFRPGNCEJNEKU-FDGPNNRMSA-L (z)-4-oxopent-2-en-2-olate;platinum(2+) Chemical compound [Pt+2].C\C([O-])=C\C(C)=O.C\C([O-])=C\C(C)=O KLFRPGNCEJNEKU-FDGPNNRMSA-L 0.000 description 2
- QYLFHLNFIHBCPR-UHFFFAOYSA-N 1-ethynylcyclohexan-1-ol Chemical compound C#CC1(O)CCCCC1 QYLFHLNFIHBCPR-UHFFFAOYSA-N 0.000 description 2
- 125000006039 1-hexenyl group Chemical group 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 2
- 239000006087 Silane Coupling Agent Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 2
- 229910002113 barium titanate Inorganic materials 0.000 description 2
- IJOOHPMOJXWVHK-UHFFFAOYSA-N chlorotrimethylsilane Chemical compound C[Si](C)(C)Cl IJOOHPMOJXWVHK-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 239000003431 cross linking reagent Substances 0.000 description 2
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- FFUAGWLWBBFQJT-UHFFFAOYSA-N hexamethyldisilazane Chemical compound C[Si](C)(C)N[Si](C)(C)C FFUAGWLWBBFQJT-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
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- 150000004767 nitrides Chemical class 0.000 description 2
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- 229910052709 silver Inorganic materials 0.000 description 2
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- 239000000126 substance Substances 0.000 description 2
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- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- UBRWPVTUQDJKCC-UHFFFAOYSA-N 1,3-bis(2-tert-butylperoxypropan-2-yl)benzene Chemical compound CC(C)(C)OOC(C)(C)C1=CC=CC(C(C)(C)OOC(C)(C)C)=C1 UBRWPVTUQDJKCC-UHFFFAOYSA-N 0.000 description 1
- VMAWODUEPLAHOE-UHFFFAOYSA-N 2,4,6,8-tetrakis(ethenyl)-2,4,6,8-tetramethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane Chemical compound C=C[Si]1(C)O[Si](C)(C=C)O[Si](C)(C=C)O[Si](C)(C=C)O1 VMAWODUEPLAHOE-UHFFFAOYSA-N 0.000 description 1
- BJPGHILWNPIMKU-UHFFFAOYSA-N 2,4,6,8-tetrakis(hex-1-enyl)-2,4,6,8-tetramethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane Chemical compound CCCCC=C[Si]1(C)O[Si](C)(C=CCCCC)O[Si](C)(C=CCCCC)O[Si](C)(C=CCCCC)O1 BJPGHILWNPIMKU-UHFFFAOYSA-N 0.000 description 1
- DMWVYCCGCQPJEA-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane Chemical compound CC(C)(C)OOC(C)(C)CCC(C)(C)OOC(C)(C)C DMWVYCCGCQPJEA-UHFFFAOYSA-N 0.000 description 1
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 1
- KRDXTHSSNCTAGY-UHFFFAOYSA-N 2-cyclohexylpyrrolidine Chemical compound C1CCNC1C1CCCCC1 KRDXTHSSNCTAGY-UHFFFAOYSA-N 0.000 description 1
- YAQDPWONDFRAHF-UHFFFAOYSA-N 2-methyl-2-(2-methylpentan-2-ylperoxy)pentane Chemical compound CCCC(C)(C)OOC(C)(C)CCC YAQDPWONDFRAHF-UHFFFAOYSA-N 0.000 description 1
- CEBKHWWANWSNTI-UHFFFAOYSA-N 2-methylbut-3-yn-2-ol Chemical compound CC(C)(O)C#C CEBKHWWANWSNTI-UHFFFAOYSA-N 0.000 description 1
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- NECRQCBKTGZNMH-UHFFFAOYSA-N 3,5-dimethylhex-1-yn-3-ol Chemical compound CC(C)CC(C)(O)C#C NECRQCBKTGZNMH-UHFFFAOYSA-N 0.000 description 1
- HMVBQEAJQVQOTI-UHFFFAOYSA-N 3,5-dimethylhex-3-en-1-yne Chemical compound CC(C)C=C(C)C#C HMVBQEAJQVQOTI-UHFFFAOYSA-N 0.000 description 1
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- ATUZEWRBKVTWLS-UHFFFAOYSA-L 3-oxopentanoate platinum(2+) Chemical compound [Pt+2].CCC(CC(=O)[O-])=O.CCC(CC(=O)[O-])=O ATUZEWRBKVTWLS-UHFFFAOYSA-L 0.000 description 1
- XBRVPWBNRAPVCC-UHFFFAOYSA-N 4,6,11-trioxa-1-aza-5$l^{3}-silabicyclo[3.3.3]undecane Chemical class C1CO[Si]2OCCN1CCO2 XBRVPWBNRAPVCC-UHFFFAOYSA-N 0.000 description 1
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- 239000005909 Kieselgur Substances 0.000 description 1
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- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 description 1
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- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
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- 239000001257 hydrogen Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- CRJSCSRODDRNDN-UHFFFAOYSA-N methyl-tris(2-methylbut-3-yn-2-yloxy)silane Chemical compound C#CC(C)(C)O[Si](C)(OC(C)(C)C#C)OC(C)(C)C#C CRJSCSRODDRNDN-UHFFFAOYSA-N 0.000 description 1
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 125000005375 organosiloxane group Chemical group 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229910052624 sepiolite Inorganic materials 0.000 description 1
- 235000019355 sepiolite Nutrition 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 125000004469 siloxy group Chemical group [SiH3]O* 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- 239000005051 trimethylchlorosilane Substances 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 229910000010 zinc carbonate Inorganic materials 0.000 description 1
- 239000011667 zinc carbonate Substances 0.000 description 1
- 235000004416 zinc carbonate Nutrition 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
- 150000003755 zirconium compounds Chemical class 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/06—Preparatory processes
- C08G77/08—Preparatory processes characterised by the catalysts used
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/12—Polysiloxanes containing silicon bound to hydrogen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/29—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the material, e.g. carbon
- H01L23/293—Organic, e.g. plastic
- H01L23/296—Organo-silicon compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
Definitions
- the present invention relates to: a curable silicone composition that can be handled as a liquid at room temperature and form a cured product with excellent adhesive and mechanical strength upon curing; and a cured product thereof.
- the present invention further relates to an application of the composition or cured product (particularly including a semiconductor device or the like having a semiconductor member, an optical semiconductor device member, or other member for a semiconductor and the cured product).
- Curable silicone compositions can be cured to form cured products having excellent heat resistance, cold resistance, electrical insulation, weather resistance, water repellency, and transparency, and are utilized in a wide range of industrial fields.
- a cured product of such curable silicone compositions is less prone to discoloration compared with other organic materials and has reduced deterioration of physical properties overtime, and therefore is also suitable as a sealing agent for optical materials and semiconductor devices.
- Patent Document 1 and Patent Document 2 propose curable silicone compositions that form silicone elastomers with relatively high hardness, containing an alkenyl group-containing linear polyorganosiloxane, alkenyl group-containing resinous polyorganosiloxane, silicon-bonded hydrogen group-containing polyorganosiloxane, and a curing catalyst.
- these silicone compositions exhibit favorable adhesion to common base materials such as aluminum and the like, there is a problem in which little adhesion is exhibited to difficult-to-adhere base materials such as those represented by polyphenylsulfone resin.
- Patent Document 3 proposes a silicone pressure-sensitive adhesive containing an alkenyl group-containing linear polyorganosiloxane, resinous polyorganosiloxane not containing an alkenyl group, silicon-bonded hydrogen group-containing polyorganosiloxane, and a curing catalyst. These silicone compositions are known to exhibit excellent adhesion to various base materials, but resulting cured products are known to be very soft.
- Patent Document 4 proposes an invention in which a small amount of resinous polyorganosiloxane that does not contain an alkenyl group is added to a paste-like curable silicone composition containing an alkenyl group-containing linear polyorganosiloxane, silicon-bonded hydrogen group-containing polyorganosiloxane, an inorganic filler, and a curing catalyst to lower the viscosity.
- the amount of resinous polyorganosiloxane without alkenyl groups added is too small to obtain a curable silicone composition that exhibits excellent adhesion as indicated in Patent Document 3.
- Patent Document 5 discloses a hot-melt curable silicone sheet containing an alkenyl group-containing linear polyorganosiloxane, resinous polyorganosiloxane without alkenyl groups, alkenyl group-containing resinous polyorganosiloxane, silicon-bonded hydrogen group-containing polyorganosiloxane, and a curing catalyst.
- the present composition is expected to form a cured product with a certain degree of hardness and to have excellent adhesion.
- these compositions are solids at room temperature and cannot be handled as liquids, making use in applications where a liquid form is required impossible.
- Patent Document 1 Japanese Unexamined Patent Application 2012-12433
- Patent Document 2 Japanese Unexamined Patent Application 2012-12434
- Patent Document 3 Japanese Unexamined Patent Application H7-197008
- Patent Document 4 Japanese Unexamined Patent Application H7-179764
- Patent Document 5 Japanese PCT Patent Application 2017-512224
- an object of the present invention is to provide: a curable silicone composition that can be handled as a liquid at room temperature, where a cured product thereof has excellent adhesive and mechanical properties and exhibits relatively high hardness; and an application thereof.
- a curable silicone composition containing an organopolysiloxane resin having a curing reactive functional group that contains a carbon-carbon double bond, an organopolysiloxane resin not having the curing reactive functional group, and a linear organopolysiloxane in a liquid state at 25° C. having a curing reactive functional group, in specific mass % ranges, as well as a curing agent, wherein the viscosity of the entire composition is 50 Pa ⁇ s or less, and the amount of the curing reactive functional groups in 100 g of the composition is 1.5 mol % or more.
- the problems can also be solved by a cured product of the composition, and a use of the cured product in a semiconductor application or the like; thus, the present invention was achieved.
- the organopolysiloxane resin having a curing reactive functional group containing a carbon-carbon double bond as described above particularly preferably has a weight average molecular weight that is at a certain level or lower, an amount of alkenyl groups in a molecule that is at a certain amount or higher, and a component ratio of siloxane units forming the organopolysiloxane resin that is within a certain range.
- the composition preferably is curable by a hydrosilylation reaction.
- a cured product obtained by curing the composition according to the present invention can be preferably used as a semiconductor member.
- the curable silicone composition of the present invention is a liquid at room temperature and is applicable to processes that can only be used with liquid compositions, such as dispensing applications and the like.
- a resulting cured product exhibits favorable adhesion to various base materials, particularly to so-called difficult-to-adhere base materials such as polyphenylene sulfone resins and the like, and therefore can be applied to base materials, processes, and applications in which application is difficult with conventional, general silicone elastomer forming compositions.
- the cured product obtained by curing the present composition demonstrates sufficient mechanical strength and elastomeric hardness, and therefore can be used not only as an adhesive to adhere two base materials, but also as a sealing agent or protective material to protect the base materials.
- the curable silicone composition of the present invention can optionally be supplemented with various inorganic and functional fillers while maintaining the advantageous properties described above, and a resulting cured product can be further provided with special functions such as thermal conductivity, light reflectivity, and the like. Therefore, the cured product is extremely useful as a semiconductor member.
- the curable silicone composition according to the present invention at least contains:
- additives may be added so long as the technical effect of the present invention is not impaired.
- Component (A1) above is one of the main agents of the present composition and is an organopolysiloxane resin having a curing reactive functional group with a carbon-carbon double bond included in a molecule and containing a siloxane unit expressed by RSiO 3/2 or SiO 4/2 , which are branch units, making up at least 20 mol % or more of the total siloxane units.
- R represents a monovalent organic group, a hydroxyl group or an alkoxy group, and is preferably selected from curing reactive groups with a carbon-carbon double bond described below, monovalent hydrocarbon groups with 1 to 10 carbon atoms without a carbon-carbon double bond, hydroxyl groups, or alkoxy groups with 1 to 10 carbon atoms.
- the curing reactive group having a carbon-carbon double bond may be a functional group having a carbon-carbon double bond such as a (meth)acryloxy group or the like, but is particularly preferably a hydrosilylation reactive functional group.
- a functional group can form a cured product when component (C) described later is a curing agent that is an organohydrogenpolysiloxane and a hydrosilylation reaction catalyst.
- Examples of such a curing reactive group include alkenyl groups with 2 to 10 carbons, and is particularly preferably a vinyl group or 1-hexenyl group.
- the amount of alkenyl groups in component (A1) is 1 to 50 mol %, preferably 2 to 45 mol %, and more preferably 2 to 35 mol % of all silicon-bonded organic groups.
- the amount of alkenyl groups in component (A1) is 1 to 50 mol %, preferably 2 to 45 mol %, and more preferably 2 to 35 mol % of all silicon-bonded organic groups.
- Component (A1) may contain other functional groups that do not have a carbon-carbon double bond, and in particular, preferably contains a monovalent hydrocarbon group with 1 to 10 carbon atoms that does not have a carbon-carbon double bond, and particularly preferably contains an alkyl group with 1 to 10 carbon atoms such as a methyl group or the like.
- the functional group bonded to the silicon atom in component (A1) is a group selected from methyl groups, vinyl groups and other alkenyl groups, and 50 to 99 mol % of all silicon-bonded organic groups are preferably methyl groups, 55 to 98 mol % of all organic groups bonded to silicon atoms are more preferably methyl groups, and 65 to 98 mol % of all silicon-bonded organic groups are particularly preferably methyl groups, with any other functional group bonded to a silicon atom being a vinyl group or other alkenyl group.
- component (A1) has higher mutual solubility with other components, and coloring resistance and the like of a resulting cured product at high temperatures is improved. Note that a small amount of hydroxyl groups or alkoxy groups may be included in component (A1).
- Component (A1) contains a siloxane unit expressed by RSiO 3/2 or R 4/2 , which are branch units, making up at least 20 mol % or more of the total siloxane units, preferably the RSiO 3/2 or R 4/2 , which are branch units, make up least 40 mol % or more of the total siloxane units, more preferably 50 mol % or more, and particularly preferably they are within a range of 50 to 90 mol %.
- R preferably represents a monovalent organic group, and particularly preferably a methyl group from the perspective of compatibility with other components.
- each R 1 independently represents a monovalent hydrocarbon group with 1 to 10 carbon atoms, but 1 to 50 mol % of all R 1 s in a molecule represents an alkenyl group
- each R 2 represents a hydrogen atom or an alkyl group with 1 to 10 carbon atoms
- each R 1 independently represents a monovalent hydrocarbon group having 1 to 10 carbon atoms, such as groups selected from a group consisting of: methyl groups and other alkyl groups with 1 to 10 carbon atoms, particularly preferably methyl groups; vinyl groups and other alkenyl groups with 2 to 10 carbon atoms; phenyl groups and other aryl groups; and benzyl groups and other aralkyl groups.
- 2 to 45 mol % of all R 1 s in one molecule are alkenyl groups
- 2 to 35 mol % of all R 1 s in one molecule are preferably alkenyl groups, and particularly preferably vinyl groups and/or 1-hexenyl groups.
- each R 1 preferably represents a functional group selected from the alkyl groups and alkenyl groups above, but from the perspective of the technical effect of the present invention, the R 1 preferably does not substantially contain a phenyl group or other aryl group.
- R 2 represents a hydrogen atom or an alkyl group having or 1 to 10 carbon atoms.
- the group R 2 O 1/2 containing the R 2 corresponds to a hydroxyl group or alkoxy group of the organopolysiloxane resin of component (A1).
- a represents a number indicating the percentage of siloxane units in the general formula: R 1 3 SiO 1/2 .
- “a” satisfies 0.1 ⁇ a ⁇ 0.90, and preferably satisfies 0.15 ⁇ a ⁇ 0.85. If “a” is within the range above, a composition containing the present component can form a cured product with excellent mechanical strength.
- “b” represents a number indicating the percentage of siloxane units in the general formula: R 1 2 SiO 2/2 . “b” satisfies 0 ⁇ b ⁇ 0.70, and preferably satisfies 0 ⁇ b ⁇ 0.60. If “b” is at or below the upper limit of the range above, it is possible to obtain a composition in which the viscosity of the composition containing the present component does not become too high.
- “c” represents a number indicating the percentage of siloxane units in the general formula: R 3 SiO 3/2 . “c” satisfies 0 ⁇ c ⁇ 0.80, and preferably satisfies 0 ⁇ c ⁇ 0.75. If “c” is at or below the upper limit of the range above, it is possible to obtain a composition in which the viscosity of the composition containing the present component does not become too high and the mechanical strength of a resulting cured product is excellent. In the present invention, “c” may be 0 and is preferably 0.
- “d” represents a number indicating the percentage of siloxane units with the formula SiO 4/2 , and must satisfy the condition 0.00 ⁇ d ⁇ 0.65, preferably satisfies 0.15 ⁇ d ⁇ 0.65, and particularly preferably satisfies 0.20 ⁇ d ⁇ 0.65. If “d” is within the numerical value range above, it is possible to obtain a composition in which the viscosity of the composition containing the present component does not become too high and the mechanical strength of a resulting cured product is excellent.
- c or “d” in the aforementioned formula may be 0, but must satisfy c+d>0.20. If the value of c+d is 0.20 or less, the hardness of a resulting cured product cannot be increased, and a technical effect of the present invention may not be sufficiently achieved.
- e is a number indicating the percentage of units in the general formula: R 2 O 1/2 , where the units are a hydroxyl group or alkoxy group bonded to a silicon atom that can be contained in the organopolysiloxane resin. “e” satisfies 0 ⁇ e ⁇ 0.05, preferably 0 ⁇ e ⁇ 0.03. Note that in the formula above, the sum of “a”, “b”, “c” and “d”, which is the sum of each siloxane unit, is equal to 1.
- Component (A1) is an organopolysiloxane resin having the characteristics above, which may be liquid or solid at room temperature, but whose weight average molecular weight (Mw) as measured by gel permeation chromatography (GPC) using toluene as a solvent is 15,000 or less, more preferably 10,000 or less, and particularly preferably within a range of 100 to 10,000.
- Mw weight average molecular weight
- GPC gel permeation chromatography
- the viscosity of the overall composition can be reduced by using component (A1) of a relatively low molecular weight.
- the added amount of component (A1) must be within a range of 1 to 50 mass % of the total amount (100 mass %) of components (A1), (A2), and (B).
- the range is preferably 1 to 45 mass %, and more preferably 1 to 40 mass %.
- the overall viscosity of the composition and the amount of component (A1) added can be controlled and the relative added amount of component (A2) can be increased, which further improves the adhesion and mechanical strength, which is represented by the hardness of the cured product.
- Component (A2) is one of the main agents of the present composition and is an organopolysiloxane resin having a curing reactive functional group with a carbon-carbon double bond included in a molecule, and containing a siloxane unit expressed by SiO 4/2 making up at least 20 mol % or more of the total siloxane units.
- Component (A2) does not contain a curing reactive functional group containing a carbon-carbon double bond such as an alkenyl group or the like in a molecule, while preferably containing a monovalent hydrocarbon group with 1 to 10 carbon atoms without a carbon-carbon double bond, and particularly preferably a functional group selected from methyl groups and other alkyl groups with 1 to 10 carbon atoms, and aryl groups.
- component (A2) If the amount of aryl groups in component (A2) exceeds the upper limit above, component (A2) becomes hot-meltable, making it difficult to obtain a desired liquid composition, a reinforcing effect of a cured product derived from siloxane units expressed by SiO 4/2 in a molecule may decrease, and the coloring resistance of the cured product under high temperature may deteriorate.
- component (A2) Preferably, 70 to 100 mol % of the silicon-bonded organic groups in component (A2) are preferably methyl groups, 80 to 100 mol % are more preferably methyl groups, and 88 to 100 mol % are particularly preferably methyl groups.
- component (A2) can be a component that has a particularly excellent reinforcing effect for cured products containing siloxane units expressed by SiO 4/2 .
- the organopolysiloxane resin of component (A2) may contain a small amount of hydroxyl groups or alkoxy groups.
- Component (A2) is an organopolysiloxane resin and contains a siloxane unit that is a branched siloxane unit expressed by SiO 4/2 making up at least 20 mol % or more of the total siloxane units in the molecule.
- the SiO 4/2 unit of the organopolysiloxane of component (A2) is at least 40 mol %, more preferably 50 mol % or more, and particularly preferably within a range of 50 to 65 mol % of all siloxane units.
- component (A2) is (A2-1) an organopolysiloxane resin expressed by the following average unit formula:
- each R 3 independently represents a monovalent hydrocarbon group with 1 to 10 carbon atoms and that does not contain a carbon-carbon double bond
- R 2 represents a hydrogen atom with an alkyl group with 1 to 10 carbon atoms
- R 2 represents the same group as above, and is preferably a hydrogen atom or a methyl group.
- R 3 independently represents a monovalent hydrocarbon group having 1 to 10 carbon atoms and containing no carbon-carbon double bond, such as a methyl group or other alkyl group.
- 70 mol % or more, and more preferably 88 mol % or more of the total R 3 in one molecule is a methyl group or other alkyl group with 1 to 10 carbon atoms, and particularly a methyl group.
- R 3 is preferably substantially free of phenyl groups and other aryl groups.
- f represents a number indicating the percentage of siloxane units in the general formula: R 3 3 SiO 1/2 .
- “f” satisfies 0.35 ⁇ f ⁇ 0.55, and preferably 0.40 ⁇ f ⁇ 0.50. If “f” is within the range above, a cured product made of the curable silicone composition containing the present component can be provided with excellent adhesive properties and mechanical strength.
- “g” represents a number indicating the percentage of siloxane units in the general formula: R 1 2 SiO 2/2 . “g” satisfies 0 ⁇ g ⁇ 0.20, and preferably 0 ⁇ g ⁇ 0.10. If “g” is at or below the upper limit of the range, the viscosity of the curable silicone composition containing the present component does not become too high. In the present invention, “g” may be 0 and is preferably 0.
- “h” represents a number indicating the percentage of siloxane units in the general formula: R 1 SiO 3/2 . “h” satisfies 0 ⁇ h ⁇ 0.20, and preferably 0 ⁇ h ⁇ 0.10. If “h” is at or below the upper limit of the range, the viscosity of the curable silicone composition containing the present component does not become too high and a resulting cured product can be provided with excellent mechanical strength. In the present invention, “h” may be 0 and is preferably 0.
- i represents a number indicating the percentage of SiO 4/2 siloxane units, and preferably satisfies 0.30 ⁇ i ⁇ 0.65, and particularly preferably satisfies 0.50 ⁇ i ⁇ 0.65. If “i” is within the numerical value range, a cured product obtained by curing the curable silicone composition containing the present component can be provided with excellent adhesion and mechanical strength.
- “i” is a number indicating the percentage of units of the general formula: R 2 O 1/2 , where the units are a hydroxyl group or alkoxy group bonded to a silicon atom that can be contained in the organopolysiloxane resin.
- “j” satisfies 0 ⁇ j ⁇ 0.05, preferably 0 ⁇ j ⁇ 0.03. Note that in the formula above, the sum of “f”, “g”, “h” and “i”, which is the sum of each siloxane unit, is equal to 1.
- Component (A2) is an organopolysiloxane resin having the characteristics above, which may be liquid or solid at room temperature, but whose weight average molecular weight (Mw) as measured by GPC using toluene as a solvent is preferably 15,000 or more, and particularly preferably within a range of 15,000 to 100,000, from the perspective of being able to provide a cured product containing the present composition with excellent adhesive properties and mechanical strength.
- Mw weight average molecular weight
- the added amount of component (A2) is within a range of 20 to 70 mass %, and preferably 25 to 60 mass % of the total amount (100 mass %) of components (A1), (A2), and (B).
- component (A2) has a relatively high molecular weight and is added in a large amount relative to the total amount of components (A1), (A2), and (B) to provide a resulting cured product with excellent adhesive properties and mechanical strength, while adding a small amount of component (A1), which has a relatively low molecular weight and contains a large amount of curing reactive groups, to reduce the viscosity of the overall composition and increase the hardness and the like of a resulting cured product.
- Component (B) is one of the main agents of the present curable silicone composition, and is a linear organopolysiloxane that is liquid at 25° C. and has a curing reactive functional group containing at least two carbon-carbon double bonds in a molecule.
- a curing reactive chain organopolysiloxane can be used in combination with the aforementioned component (A1) or component (A2), which are organopolysiloxane resins, to provide mechanical strength to a resulting cured product.
- Component (B) must have a curing reactive functional group having a carbon-carbon double bond in a molecule.
- a curing reactive functional group is hydrosilylation reactive, and forms a cured product by a cross-linking reaction with another component.
- Such a curing reactive functional group is preferably an alkenyl group similar to that provided by component (A1), and particularly preferably a vinyl group or hexenyl group.
- Component (B) is a linear organopolysiloxane that is liquid at 25° C. (room temperature) and plays an important role in reducing the viscosity of the composition of the present invention.
- the chemical structure of the organopolysiloxane of component (B) is preferably
- each R 4 independently represents a monovalent hydrocarbon group having 1 to 10 carbon atoms, such as groups selected from a group consisting of: methyl and other alkyl groups, and particularly preferably methyl groups; vinyl and other alkenyl groups, and particularly preferably vinyl groups and/or hexenyl groups; phenyl and other aryl groups; and benzyl and other aralkyl groups. Furthermore, at least two of the R 4 in one molecule are alkenyl groups, and preferably a vinyl group.
- each R 4 is preferably a functional group selected from a group consisting of methyl groups and other alkyl groups having 1 to 10 carbon atoms and vinyl groups, hexenyl groups and other alkenyl groups, and it is preferable that of all R 4 s, at least two are alkenyl groups per molecule, and the remaining R 4 are methyl groups.
- R 4 is preferably substantially free of phenyl groups and other aryl groups. If a large amount of phenyl groups or other aryl groups are included, the coloring resistance at high temperatures of the cured product obtained from the curable silicone composition may deteriorate.
- a vinyl group or other alkenyl group is preferred at both ends of a molecular chain, with the rest of R 4 being a methyl group.
- k represents a number between 20 and 1,000 preferably between 30 and 800, and particularly preferably between 30 and 500. If k is at or above the lower limit of the above range, a resulting cured product can be provided with sufficient mechanical properties. On the other hand, if k is at or below the upper limit of the range above, an increase in the viscosity of the overall curable silicone composition can be suppressed.
- the added amount of component (B) is within a range of 15 to 70 mass %, preferably 20 to 65 mass %, and more preferably 20 to 60 mass % of the total amount (100 mass %) of components (A1), (A2), and (B).
- the added amount of component (B) is within a range of 15 to 70 mass %, preferably 20 to 65 mass %, and more preferably 20 to 60 mass % of the total amount (100 mass %) of components (A1), (A2), and (B).
- Component (C) is a curing agent for curing component (A1) and component (B) described above, and is specifically one or more curing agent selected from (c1) or (c2) below. Two or more of these curing agents may be used in combination, for example, the cure system may include both a (c1) component and a (c2) component.
- Organic peroxide is a component that cures component (A) and component (B) described above by heating, and examples include alkyl peroxides, diacyl peroxides, ester peroxides, and carbonate peroxides.
- component (c1) can also react with some of the (A2) components.
- the organic peroxide preferably has a 10-hour half-life temperature of 90° C. or higher or 95° C. or higher.
- organic peroxide examples include dicumyl peroxide, di-tert-butyl peroxide, di-tert-hexyl peroxide, tert-butylcumyl peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 1,3-bis(tert-butylperoxyisopropyl)benzene, di-(2-tert-butylperoxyisopropyl)benzene, and 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxonan.
- the amount of the organic peroxide (c1) is preferably within a range of 0.05 to 10 mass parts, or within the range of 0.10 to 5.0 mass parts, relative to the total (100 mass parts) of component (A1), component (A2), and component (B).
- the organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in the (c2) molecule and the hydrosilylation reaction catalyst are components that cure the composition by an addition reaction (hydrosilylation reaction) of the organohydrogenpolysiloxane, which is a crosslinking agent, with the carbon-carbon double bond in component (A1) and component (B) in the presence of the hydrosilylation reaction catalyst.
- component (c2) may be an organohydrogenpolysiloxane having, as a main constituent unit, a hydrogen organosiloxy unit expressed by HR 2 SiO 1/2 (D H unit, where R independently represents a monovalent organic group), and at the end thereof a hydrogendiorganosiloxy unit expressed by HR 2 SiO 1/2 (M H unit, where R independently represents a monovalent organic group).
- the curable silicone composition is a chain-like organohydrogenpolysiloxanes made up of the D H units described above, or the like, sufficient curing is possible for practical use.
- the organohydrogenpolysiloxane is preferably an organohydrogenpolysiloxane resin containing a monoorganosiloxy unit expressed by RSIO 3/2 (T unit, where R represents a monovalent organic group or a silicon-bonded hydrogen atom) or a branch unit of a siloxy unit (Q unit) expressed by SiO 4/2 , having at least two hydrogendiorganosiloxy units expressed by HR 2 SiO 1/2 (M H unit, where R independently represents a monovalent organic group), and having the M H unit at a molecular terminal.
- RSIO 3/2 T unit, where R represents a monovalent organic group or a silicon-bonded hydrogen atom
- Q unit siloxy unit
- M H unit where R independently represents a monovalent organic group
- a particularly preferred organohydrogenpolysiloxane is an organohydrogenpolysiloxane resin expressed by the following average unit formula:
- each R 5 is the same or different hydrogen atom or monovalent hydrocarbon group having 1 to 10 carbon atoms without an aliphatic unsaturated carbon bond, where at least two R 5 in one molecule are hydrogen atoms.
- a monovalent hydrocarbon group corresponding to R 5 includes, for example: methyl and other alkyl groups; phenyl and other aryl groups; benzyl and other aralkyl groups; other halogenated alkyl groups; and the like. From an industrial viewpoint, methyl groups or phenyl groups are preferred.
- R 6 represents a monovalent hydrocarbon group with 1 to 10 carbon atoms without an aliphatic unsaturated carbon bond, and examples include the same groups as the monovalent hydrocarbon group described above.
- R 2 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, for example, R 2 in the above component (A1) or component (A2).
- the organohydrogenpolysiloxane resin serving as a part of component (d2) is specifically preferably a M H MT resin, M H MTTH resin, M H MTQ resin, M H MQ resin, M H MTT H Q, or M H Q resin.
- a particularly preferably organohydrogenpolysiloxane serving as a part of component (c2) is an M H Q resin expressed by:
- I1+p1 1, and it is preferable to have 0.1 ⁇ I1 ⁇ 0.80 and 0.20 ⁇ p1 ⁇ 0.90.
- the organohydrogenpolysiloxane that is part of component (c2) may include straight-chain diorganopolyoxane, organohydrogenpolysiloxane, or diorganopolysiloxane whose molecular chain ends are capped by silicon-bonded hydrogen atoms or trimethylsiloxy groups.
- the degree of polymerization of siloxane of these straight-chain organohydrogenpolysiloxanes is not particularly limited, but is in the range of 2 to 200, and is preferably in the range of 5 to 100.
- the amount of the organohydrogenpolysiloxane, which is a part of component (c2), is an amount sufficient to cure the curable silicone composition of the present invention, and the molar ratio of the silicon-bonded hydrogen atom in the organohydrogenpolysiloxane is 0.9 or more and preferably in the range of 0.9 to 2.0 relative to the curing reactive functional group (for example, a vinyl group or other alkenyl group) containing a carbon-carbon double bond in component (A1) and component (B).
- the curing reactive functional group for example, a vinyl group or other alkenyl group
- Examples of the hydrosilylation reaction catalyst serving as a part of component (c2) include platinum-based catalysts, rhodium-based catalysts, and palladium-based catalysts. Platinum-based catalysts are preferred due to the ability to remarkably promote curing of the present composition.
- Exemplary platinum-based catalysts include platinum fine powder, chloroplatinic acid, an alcohol solution of chloroplatinic acid, a platinum-alkenyl siloxane complex, a platinum-olefin complex, a platinum-carbonyl complex, and a catalyst in which these platinum-based catalysts are dispersed or encapsulated with a thermoplastic resin such as silicone resin, polycarbonate resin, acrylic resin, or the like, with a platinum-alkenyl siloxane complex particularly preferable.
- a thermoplastic resin such as silicone resin, polycarbonate resin, acrylic resin, or the like
- a 1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex of platinum is preferred, and is preferably added in the form of an alkenylsiloxane solution of the complex.
- a platinum containing hydrosilylation reaction catalyst in microparticles dispersed and encapsulated with thermoplastic resin may be used.
- a non-platinum based metal catalyst such as iron, ruthenium, iron/cobalt, or the like may be used.
- the hydrosilylation reaction catalyst serving as a part of component (c2) may be a hydrosilylation reaction catalyst (component (c2-1)) which does not exhibit activity without irradiation with the high energy beam below, but exhibits activity in the composition by irradiation with a high energy beam.
- Component (c2-1) is a so-called high energy beam activated catalyst or photoactivated catalyst, which is known in the present technical field.
- high energy beams examples include ultraviolet rays, gamma rays, X-rays, alpha rays, electron beams, and the like.
- examples include ultraviolet rays, X-rays, and electron beams irradiated from a commercially available electron beam irradiating device.
- ultraviolet rays are preferable from the perspective of efficiency of catalyst activation, and ultraviolet rays within a wavelength range of 280 to 380 nm are preferable from the perspective of industrial use.
- the amount of irradiation varies depending on the type of high energy beam activated catalyst, but in the case of ultraviolet rays, the integrated amount of irradiation at a wavelength of 365 nm is preferably within a range of 100 mJ/cm 2 to 100 J/cm 2 .
- component (c2-1) include (methylcyclopentadienyl) trimethyl platinum (IV), (cyclopentadienyl) trimethyl platinum (IV), (1,2,3,4,5-pentamethyl cyclopentadienyl) trimethyl platinum (IV), (cyclopentadienyl) dimethylethyl platinum (IV), (cyclopentadienyl) dimethylacetyl platinum (IV), (trimethylsilyl cyclopentadienyl) trimethyl platinum (IV), (methoxycarbonyl cyclopentadienyl) trimethyl platinum (IV), (dimethylsilyl cyclopentadienyl) trimethylcyclopentadienyl platinum (IV), trimethyl (acetylacetonato) platinum (IV), trimethyl (3,5-heptanedionate) platinum (IV), trimethyl (methylacetoacetate) platinum (IV), bis(2,4-pentanedionato) platinum (II), bis(2,4-hexan
- the amount of the hydrosilylation reaction catalyst which is a part of component (c2), is preferably an amount in which a metal atom is within a range of 0.01 to 500 ppm, an amount within a range of 0.01 to 100 ppm, or an amount within a range of 0.01 to 50 ppm in terms of mass units relative to the entire composition.
- Particularly preferred components (c2) include at least an organohydrogenpolysiloxane resin expressed by the average unit formula described above and a hydrosilylation reaction catalyst.
- the curable silicone composition of the present invention may further contain (D) functional filler in addition to components (A1) to (C) above, if imparting functionality to a resulting cured product is desired.
- the functional filler which is component (D), is a component that imparts mechanical or other properties to the cured product, and examples include inorganic fillers, organic fillers, and mixtures thereof.
- examples of the inorganic fillers include a reinforcing filler, a white pigment, a thermally conductive filler, an electrically conductive filler, a phosphor, and mixtures of at least two of these, and examples of organic fillers include a silicone resin filler, a fluorine resin filler, and a polybutadiene resin filler.
- the shape of these fillers is not particularly limited and may be spherical, spindle-shaped, flat, needle-shaped, amorphous, or the like.
- a reinforcing filler can be included in at least a part of component (D) from the perspective of improving the mechanical strength, protection, and adhesion of the cured product.
- Reinforcing fillers may be added to improve the mechanical strength of the cured product, to improve protection and adhesion, and to maintain a solid particle shape as a binder filler in the curable silicone composition before curing.
- this type of reinforcing filler include fumed silica, precipitated silica, fused silica, calcined silica, fumed titanium dioxide, quartz, calcium carbonate, diatomaceous earth, aluminum oxide, aluminum hydroxide, zinc oxide, and zinc carbonate.
- These reinforcing fillers may also be surface treated with: organoalkoxysilanes such as methyltrimethoxysilane; organohalosilanes such as trimethylchlorosilane; organosilazanes such as hexamethyldisilazane; siloxane oligomers such as dimethylsiloxane oligomers capped with ⁇ , ⁇ -silanol groups, methylphenylsiloxane oligomers capped with ⁇ , ⁇ -silanol groups, methylvinylsiloxane oligomers capped with ⁇ - ⁇ -silanol groups, or the like.
- organoalkoxysilanes such as methyltrimethoxysilane
- organohalosilanes such as trimethylchlorosilane
- organosilazanes such as hexamethyldisilazane
- siloxane oligomers such as dimethylsiloxane oli
- the particle size of the reinforcing filler is not restricted, but the median diameter measured by a laser diffraction scattering type particle size distribution measurement is preferably within a range of 1 nm to 500 ⁇ m.
- a fibrous filler such as calcium metasilicate, potassium titanate, magnesium sulfate, sepiolite, zonolite, aluminum borate, rock wool, glass fiber, or the like may be used.
- a white pigment, a thermally conductive filler, an electrically conductive filler, or a phosphor may be blended for the purpose of imparting other functions to the cured product obtained using the composition.
- Organic fillers such as silicone microparticles or the like may also be blended for the purpose of improving the stress relief properties of the cured product and the like.
- the white pigment is a component that imparts whiteness to the cured product and improves light reflectivity, and the cured product obtained by curing the present composition by blending the component can be used as a light reflective material for light emitting/optical devices.
- the white pigment include metal oxides such as titanium oxide, aluminum oxide, zinc oxide, zirconium oxide, magnesium oxide, and the like; hollow fillers such as glass balloons, glass beads, and the like; and additionally, barium sulfate, zinc sulfate, barium titanate, aluminum nitride, boron nitride, and antimony oxide. Titanium oxide has high optical reflectivity and concealing properties, and is therefore preferable.
- the average particle size or shape of the white pigment is not restricted, but the average particle diameter is within a range of 0.05 to 10.0 ⁇ m and preferably within a range of 0.1 to 5.0 ⁇ m.
- surface treatment of the white pigment can be performed using a silane coupling agent, silica, aluminum oxide, and the like.
- a thermally conductive filler or an electrically conductive filler is added to the cured product for the purpose of imparting thermal conductivity/electrical conductivity thereto, and specific examples include: a metallic fine powder such as gold, silver, nickel, copper, or aluminum; a fine powder such as ceramic, glass, quartz or organic resin, the surface thereof on which a metal such as gold, silver, nickel, or copper is deposited or plated; a metallic compound such as aluminum oxide, magnesium oxide, aluminum nitride, boron nitride or zinc oxide or the like; and graphite, and mixtures of two or more of these.
- a metallic fine powder such as gold, silver, nickel, copper, or aluminum
- a fine powder such as ceramic, glass, quartz or organic resin, the surface thereof on which a metal such as gold, silver, nickel, or copper is deposited or plated
- a metallic compound such as aluminum oxide, magnesium oxide, aluminum nitride, boron nitride or zinc oxide or the like
- graphite and mixtures
- a metal oxide-based powder or a metal nitride-based powder is preferable, and in particular, an aluminum oxide powder, a zinc oxide powder, or an aluminum nitride powder is preferable and combinations of type, particle diameter, and particle shape and the like can be used according to these thermal conductivity/electrical conductivity requirements.
- Phosphor is a component that is blended to convert the emission wavelength from a light source (optical semiconductor device) when the cured product is used as a wavelength conversion material.
- a light source optical semiconductor device
- this phosphor there are no particular limitations to this phosphor, with examples thereof including yellow, red, green, and blue light phosphors, which include oxide phosphors, oxynitride phosphors, nitride phosphors, sulfide phosphors, oxysulfide phosphors, and the like, that are widely used in light emitting diodes (LED).
- Silicone microparticles include non-reactive silicone resin microparticles and silicone elastomer microparticles, but silicone elastomer microparticles are suitably exemplified from the viewpoint of improving cured product flexibility or stress relief properties.
- the filler surface may be treated using a specific surface treatment agent within a range of 0.1 to 2.0 mass %, 0.1 to 1.0 mass %, or 0.2 to 0.8 mass % of the total mass of component (D).
- these surface treatment agents include, methylhydrogen polysiloxane, silicone resins, metal soaps, silane coupling agents, perfluoroalkyl silanes, as well as fluorine compounds such as perfluoroalkyl phosphate ester salts.
- the amount of component (D) is not limited, but the amount is preferably within a range of 1 to 2,000 mass parts, within a range of 1 to 1,500 mass parts, or within a range of 1 to 1,000 mass parts relative to the sum (100 mass parts) of components (A1) to (C) from the perspective of excellent hardness and mechanical strength of a resulting cured product.
- the curable silicone composition of the present invention may further contain a curing retarder.
- the type of the curing retarder is not particularly limited, and examples include: 2-methyl-3-butyne-2-ol, 3,5-dimethyl-1-hexyne-3-ol, 2-phenyl-3-butyne-2-ol, 1-ethynyl-1-cyclohexanol, and other alkyne alcohols; 3-methyl-3-pentene-1-yne, 3,5-dimethyl-3-hexene-1-yne, and other enyne compounds; tetramethyltetravinylcyclotetrasiloxane, tetramethyltetrahexenylcyclotetrasiloxane, and other alkenyl group-containing low molecular weight siloxanes; and methyl tris(1,1-dimethyl propynyloxy)silane, vinyl tris(1,1-dimethyl)silane, vinyl tris(1,
- the amount of the curing retarder in the curable silicone composition is not particularly limited, but is preferably within a range of 10 to 10,000 ppm in mass units, with regard to the composition.
- a material conventionally known in the field may be added to the curable silicone composition of the present invention as an additive that may be used in a silicone composition, and examples of additives that may be used include, but are not limited to, those described below.
- the composition of the present invention may contain an adhesion imparting agent so long as the object of the present invention is not impaired.
- adhesion imparting agents are common to components suitably exemplified by the present applicant in the international patent application (PCT/JP2020/12027), and reaction mixtures of epoxy group-containing organoalkoxysilane and amino group-containing organoalkoxysilane disclosed in Japanese Unexamined Patent Application S52-8854 and Japanese Unexamined Patent Application H10-195085, and particularly carbasilatrane derivatives having a silicon-bonded alkoxy group or silicon-bonded alkenyl group in a molecule, silatrane derivatives having an alkoxysilyl group-containing organic group, and the like can be preferably used in addition to 3-glycidoxypropyltrimethoxysilane and other silane compounds, organosiloxane oligomers, and alkyl silicates.
- composition may contain, as other optional components, heat resistance agents such as iron oxide (red iron oxide), cerium oxide, cerium dimethyl silanolate, fatty acid cerium salt, cerium hydroxide, zirconium compound, and the like, with dyes, pigments other than white, flame retardant agents, and the like capable of being contained as long as the purpose of the present invention is not impaired.
- heat resistance agents such as iron oxide (red iron oxide), cerium oxide, cerium dimethyl silanolate, fatty acid cerium salt, cerium hydroxide, zirconium compound, and the like, with dyes, pigments other than white, flame retardant agents, and the like capable of being contained as long as the purpose of the present invention is not impaired.
- the curable silicone composition of the present invention is in a liquid or paste-like form, and therefore can be produced by kneading the aforementioned components (A) to (D) and an optional component by a known method.
- a mixing device used in mixing or kneading is not limited, and examples include uniaxial or biaxial continuous mixers, two-roll mixers, ROSS mixers, Hobart mixers, dental mixers, planetary mixers, kneader mixers, laboratory mills, small-sized grinders, and Henschel mixers, and preferably, laboratory mills or Henschel mixers.
- the curable silicone composition forms a cured product by either thermal curing, high energy beam curing, or high energy beam+thermal curing. Therefore, it is possible to form a cured product while demonstrating adhesion to a base material by applying the composition on or inside the base material to be cured by dispensing or the like prior to the curing process, followed by curing.
- the curable silicone composition of the present invention can be used as a liquid at room temperature and has excellent coloring resistance, adhesion to various base materials, and mechanical strength at high temperature of a resulting cured product obtained by curing the present composition at high temperature. Therefore, the composition is useful for applications such as sealing materials for light emitting/optical devices, light reflective materials and other semiconductor members, and optical semiconductors having the cured product. Furthermore, since the cured product has superior mechanical properties, the cured product is suitable as: an encapsulant for semiconductors; an encapsulant for power semiconductors such as SiC, GaN, or the like; and as an adhesive, potting agent, protective agent, and coating agent for electrical and electronic applications.
- compositions that form cured products with relatively soft and rubber elasticity can be used as a stress buffer layer (adhesive layer) between two types of base materials with different coefficients of linear expansion.
- the cured product containing the curable silicone composition of the present invention exhibits favorable adhesion to difficult-to-adhere base materials such as polyphenylene sulfone resin, silicone resin, fluororesin, and the like, and can therefore be used for sealing these base materials, as a stress-relief layer to adhere two different base materials, or the like.
- the curable silicone composition of the present invention may be a sealing agent for single-sided sealing or for double-sided sealing along with adhesion between two base materials, and have preferred properties suitable for these applications.
- the curable silicone composition of the present invention can use thermal curing, curing with high energy beams such as ultraviolet light or the like, or curing with a combination thereof, depending on the selection of component (C).
- thermal curing exposure to temperatures of 100° C. or higher, and preferably 150° C. or higher, generally allows curing to rapidly advance.
- high energy beam curing type after irradiation of the light beam, curing progresses by leaving at room temperature or by heating. Therefore, it is easy to ensure stability as a liquid composition by applying to a base material before irradiating with a high energy beam. After applying to a base material, the present composition can be cured quickly at 25° C. or at low temperatures of 100° C. or lower by irradiating with a high energy beam.
- the composition of the present invention is characterized by the ability to be handled as a liquid at 25° C., and therefore, the viscosity thereof must be 50 Pa ⁇ s or less at a shear rate of 10 (1/s). 30 Pa ⁇ s or less is preferred, 10 Pa ⁇ s or less is more preferred, and a range of 0.01 to 10 Pa ⁇ s is particularly preferred. By keeping the viscosity of the composition at or below the range above, it is possible to accommodate processes that require low viscosity.
- the composition of the present invention contains curing reactive groups including carbon-carbon double bonds derived from component (A1), component (B), and other components, but in order to make the hardness of a resulting cured product in an elastomer region, the amount of curing reactive groups must be 1.5 mol % or more/100 g of the composition, and preferably 1.5 to 15.0 mol %/100 g of the composition.
- the amount of alkenyl groups, which are curing reactive groups is preferably 1.5 mol % or more per 100 g of the composition.
- the preferred hardness of the cured product obtained by curing the curable hot melt silicone composition of the present invention is preferably 20 or higher, as measured by a Type A durometer hardness specified in “Durometer Hardness Test Method for Plastics” of JIS K 7215-1986. 30 or higher is more preferred. This is because if the hardness is at or below the lower limit above, the cured product will be too soft and tacky and cannot be used for sealing a base material. On the other hand, if the application is not for sealing a substrate, but rather an adhesive layer to adhere two different base materials, the Type A durometer hardness may be near the lower limit. This is because a lower hardness causes better stress relaxation properties.
- An application of the cured product obtained by curing the curable silicone composition of the present invention is not particularly limited.
- the composition of the present invention can be handled as a liquid at room temperature, making it suitable for processes that require the composition to be liquid.
- a resulting cured product exhibits favorable adhesive properties to various base materials and has excellent mechanical strength, and the cured product has low surface tack and hardness in an elastomer region. Therefore, the cured product obtained by curing the present composition can be suitably used as a member for a semiconductor device, and can be suitably used as an encapsulant for a semiconductor element, an IC chip or the like, and as an adhesive/bonding member of a conductor device.
- the composition of the present invention can form optically transparent to light reflective or light shielding cured products depending on the presence or absence of component (D), and can be used for different applications.
- D component
- it is preferably a light emitting semiconductor device, which is a light-emitting/optical device, an optical member for a display, or a solar panel member, and particularly preferably a sealing material, case material, or adhesive member used in these devices and the like.
- the cured product of the present invention has excellent coloring resistance at high temperatures, and therefore is more preferably used as a sealing material, case material, or adhesive member used in electronic materials where transparency and light/heat resistance are important.
- weight average molecular weight (Mw) of the organopolysiloxane resin in each reference example was determined using gel permeation chromatography (GPC) introduced by Waters Corporation, using toluene as a mobile solvent and based on standard polystyrene equivalent.
- the curable silicone composition was heated at 150° C. for 2 hours to form a cured product.
- the hardness of the cured product was measured by a type A durometer specified in JISK 7215-1986 “Durometer Hardness Testing Method for Plastics.”
- the curable silicone composition was heated at 150° C. for 2 hours to prepare a cured product.
- the tensile elongation rate of the cured product was measured using the method specified in JIS K 6251-2010 “Vulcanized Rubber and Thermoplastic Rubber—Determination of Tensile Properties.”
- the curable silicone composition was heated at 150° C. for 2 hours to prepare a cured product. After placing a PET film on the resulting cured product and applying a load of 50 g/cm 2 for 10 seconds, the PET film was removed from the cured product. A film that peeled smoothly without adhering was rated as ⁇ , a film that strongly adhered and was difficult to peel off was rated as X, and a film that was between ⁇ and X was rated as ⁇ .
- a dispenser was used to apply the curable silicone composition on a 25 mm ⁇ 75 mm polyphenylene sulfone resin sheet at 5 locations using approximately 100 mg at each location.
- a 1 mm thick and 6 mm square aluminum chip was placed on the composition, and the assembly was pressure bonded by a 1 kg plate. The assembly was then heated at 150° C. for 2 hours to form a cured product. After cooling to room temperature, a die shear test was performed using a shear strength measuring device (Bond Tester SS-100KP manufactured by Seishin Trading Co., Ltd.), and the failure mode was visually observed to determine whether cohesive failure or interface peeling occurred.
- Curable silicone compositions were prepared by mixing each component in the parts listed in Tables 1 and 2.
- the viscosity at a shear rate of 10 (1/s) at 25° C., hardness of the cured product, tensile elongation, surface tack, and adhesion to polyphenylene sulfone resin of the cured product are shown in the tables. Note that in Comparative Example 6, the composition was exposed to 150° C. for 2 hours and a hot-melt material was obtained, but no cured product was obtained. Therefore, the physical property value of the cured product was set to “NA”.
- Embodiment 1 Embodiment 2 Embodiment 3 a1-1 28.0 a1-2 7.0 7.0 a1-3 a2-1 29.0 40.0 40.0 a2-2 b1 11.0 43.3 47.5 b2 12.0 b3 b4 c1-1 3.0 9.7 c1-2 17.0 c1-3 5.5 c1-4 c2 (ppm) 5 5 5 d e (ppm) 50 50 50 f Viscosity (mPa) 2500 4500 6700 Hardness (Shore A) 40.0 45 42 Tensile elongation (%) 88.0 130 120 Surface tack ⁇ ⁇ ⁇ Adhesion Cohesive Cohesive Cohesive failure failure failure failure Component Embodiment 4 Embodiment 5 Embodiment 6 a1-1 11.8 30.0 30.0 30.0 a1-2 3.2 a1-3 a2-1 34.3 a2-2 28.0 28.0 b1 34.7 30.00 31.2 b2 5.1 b3 b4 c1-1 7.6
- Example 2 Example 3 a1-1 a1-2 a1-3 5.0 10.0 a2-1 34.1 28.9 39.3 a2-2 b1 58.6 58.3 59.0 b2 b3 b4 c1-1 c1-2 c1-3 1.5 2.1 0.97 c1-4 c2 (ppm) 5 5 5 d e (ppm) 50 50 50 f Viscosity (mPa) 3300 2450 4800 Hardness (Shore A) 18 27 12 Tensile elongation (%) 183 154 318 Surface tack ⁇ ⁇ ⁇ Adhesion Cohesive Cohesive Cohesive failure failure failure failure Comparative Comparative Comparative Component Example 4 Example 5 Example 6 a1-1 44.6 a1-2 a1-3 37.4 a2-1 59.1 37.4 a2-2 b1 39.4 b2 5.3 b3 44.5 b4 15.3 c1-1 6.25 c1-2 4.0 c
- the curable silicone compositions of Embodiments 1 to 6 according to the present invention combine specific organopolysiloxane resins and chain organopolysiloxanes at specific ratios to obtain compositions with viscosities of 50 Pas or lower at 25° C., and cured products thereof were found to exhibit excellent adhesive properties and mechanical strength, and low surface tack with a hardness in an elastomer region of shore A 20 or higher.
- the curable silicone compositions of Comparative Examples 1 to 4 have a low concentration of curing reactive groups in the compositions, and resulting cured products are very soft and tacky on the surface, indicating that the products are not suitable in applications of sealing base materials. Furthermore, the curable silicone composition in Comparative Example 5 forms a relatively hard cured product and the surface tack thereof is low, but the adhesive properties thereof are inferior to those of the compositions in the Embodiments. Furthermore, the curable silicone composition in Comparative Example 6 was not liquid at room temperature, and no cured product was obtained even when heat was applied.
Abstract
Provided is a curable silicone composition that can be handled as a liquid at room temperature, where a cured product thereof has excellent adhesive and mechanical properties and exhibits relatively high hardness. The curable silicone composition comprises: (A1) an organopolysiloxane resin having a curing reactive functional group that contains a carbon-carbon double bond, (A2) an organopolysiloxane resin not having the curing reactive functional group, and (B) a linear organopolysiloxane in a liquid state at 25° C. having the curing reactive functional group, in specific mass % ranges, as well as (C) a curing agent. The viscosity of the entire composition is 50 Pa·s or less, and the amount of the curing reactive functional groups in 100 g of the composition is 1.5 mol % or more. Also provided is a cured product of the composition, and a use thereof in a semiconductor application and the like.
Description
- The present invention relates to: a curable silicone composition that can be handled as a liquid at room temperature and form a cured product with excellent adhesive and mechanical strength upon curing; and a cured product thereof. The present invention further relates to an application of the composition or cured product (particularly including a semiconductor device or the like having a semiconductor member, an optical semiconductor device member, or other member for a semiconductor and the cured product).
- Curable silicone compositions can be cured to form cured products having excellent heat resistance, cold resistance, electrical insulation, weather resistance, water repellency, and transparency, and are utilized in a wide range of industrial fields. In general, a cured product of such curable silicone compositions is less prone to discoloration compared with other organic materials and has reduced deterioration of physical properties overtime, and therefore is also suitable as a sealing agent for optical materials and semiconductor devices.
- For example, Patent Document 1 and Patent Document 2 propose curable silicone compositions that form silicone elastomers with relatively high hardness, containing an alkenyl group-containing linear polyorganosiloxane, alkenyl group-containing resinous polyorganosiloxane, silicon-bonded hydrogen group-containing polyorganosiloxane, and a curing catalyst. However, while these silicone compositions exhibit favorable adhesion to common base materials such as aluminum and the like, there is a problem in which little adhesion is exhibited to difficult-to-adhere base materials such as those represented by polyphenylsulfone resin.
- On the other hand, Patent Document 3 proposes a silicone pressure-sensitive adhesive containing an alkenyl group-containing linear polyorganosiloxane, resinous polyorganosiloxane not containing an alkenyl group, silicon-bonded hydrogen group-containing polyorganosiloxane, and a curing catalyst. These silicone compositions are known to exhibit excellent adhesion to various base materials, but resulting cured products are known to be very soft.
- Furthermore, Patent Document 4 proposes an invention in which a small amount of resinous polyorganosiloxane that does not contain an alkenyl group is added to a paste-like curable silicone composition containing an alkenyl group-containing linear polyorganosiloxane, silicon-bonded hydrogen group-containing polyorganosiloxane, an inorganic filler, and a curing catalyst to lower the viscosity. However, the amount of resinous polyorganosiloxane without alkenyl groups added is too small to obtain a curable silicone composition that exhibits excellent adhesion as indicated in Patent Document 3.
- Next, Patent Document 5 discloses a hot-melt curable silicone sheet containing an alkenyl group-containing linear polyorganosiloxane, resinous polyorganosiloxane without alkenyl groups, alkenyl group-containing resinous polyorganosiloxane, silicon-bonded hydrogen group-containing polyorganosiloxane, and a curing catalyst. The present composition is expected to form a cured product with a certain degree of hardness and to have excellent adhesion. However, due to the nature thereof, these compositions are solids at room temperature and cannot be handled as liquids, making use in applications where a liquid form is required impossible. As described above, there is no known silicone composition that can be handled as a liquid at room temperature and has both excellent adhesive properties as in silicone pressure-sensitive adhesives and hardness in an elastomer region.
- Patent Document 1: Japanese Unexamined Patent Application 2012-12433
- Patent Document 2: Japanese Unexamined Patent Application 2012-12434
- Patent Document 3: Japanese Unexamined Patent Application H7-197008
- Patent Document 4: Japanese Unexamined Patent Application H7-179764
- Patent Document 5: Japanese PCT Patent Application 2017-512224
- In view of the foregoing, an object of the present invention is to provide: a curable silicone composition that can be handled as a liquid at room temperature, where a cured product thereof has excellent adhesive and mechanical properties and exhibits relatively high hardness; and an application thereof.
- As a result of extensive research, the present inventors discovered that the aforementioned problems can be solved by a curable silicone composition containing an organopolysiloxane resin having a curing reactive functional group that contains a carbon-carbon double bond, an organopolysiloxane resin not having the curing reactive functional group, and a linear organopolysiloxane in a liquid state at 25° C. having a curing reactive functional group, in specific mass % ranges, as well as a curing agent, wherein the viscosity of the entire composition is 50 Pa·s or less, and the amount of the curing reactive functional groups in 100 g of the composition is 1.5 mol % or more. The problems can also be solved by a cured product of the composition, and a use of the cured product in a semiconductor application or the like; thus, the present invention was achieved.
- From the perspective of the technical effect of the present invention, the organopolysiloxane resin having a curing reactive functional group containing a carbon-carbon double bond as described above particularly preferably has a weight average molecular weight that is at a certain level or lower, an amount of alkenyl groups in a molecule that is at a certain amount or higher, and a component ratio of siloxane units forming the organopolysiloxane resin that is within a certain range. Furthermore, the composition preferably is curable by a hydrosilylation reaction. Furthermore, a cured product obtained by curing the composition according to the present invention can be preferably used as a semiconductor member.
- The curable silicone composition of the present invention is a liquid at room temperature and is applicable to processes that can only be used with liquid compositions, such as dispensing applications and the like. On the other hand, a resulting cured product exhibits favorable adhesion to various base materials, particularly to so-called difficult-to-adhere base materials such as polyphenylene sulfone resins and the like, and therefore can be applied to base materials, processes, and applications in which application is difficult with conventional, general silicone elastomer forming compositions. In addition, the cured product obtained by curing the present composition demonstrates sufficient mechanical strength and elastomeric hardness, and therefore can be used not only as an adhesive to adhere two base materials, but also as a sealing agent or protective material to protect the base materials. Note that the curable silicone composition of the present invention can optionally be supplemented with various inorganic and functional fillers while maintaining the advantageous properties described above, and a resulting cured product can be further provided with special functions such as thermal conductivity, light reflectivity, and the like. Therefore, the cured product is extremely useful as a semiconductor member.
- Embodiments of the present invention will be described below in detail.
- The curable silicone composition according to the present invention at least contains:
-
- (A1) an organopolysiloxane resin having a curing reactive functional group with a carbon-carbon double bond included in a molecule, and containing a siloxane unit expressed by RSiO3/2 (R represents a monovalent organic group, hydroxyl group or alkoxy group) or SiO4/2 making up at least 20 mol % of all siloxane units;
- (A2) an organopolysiloxane resin having a curing reactive functional group with a carbon-carbon double bond included in a molecule, and containing a siloxane unit expressed by SiO4/2 making up at least 20 mol % or more of the total siloxane units;
- (B) a linear organopolysiloxane in a liquid state at 25° C., having a curing reactive functional group containing at least two carbon-carbon double bonds in a molecule; and
- (C) one or more type of a curing agent required for curing the present composition;
- wherein
- the viscosity of the entire composition is 50 Pa·s or less, and the amount of curing reactive functional groups containing a carbon-carbon double bond in 100 g of the composition is 1.5 mol % or more. The composition may be supplemented with one or more type of filler selected from reinforcing fillers, white pigments, thermally conductive fillers, electrically conductive fillers, and organic fillers, as necessary, to add further functionality to a cured product thereof.
- Furthermore, other additives may be added so long as the technical effect of the present invention is not impaired.
- Component (A1) above is one of the main agents of the present composition and is an organopolysiloxane resin having a curing reactive functional group with a carbon-carbon double bond included in a molecule and containing a siloxane unit expressed by RSiO3/2 or SiO4/2, which are branch units, making up at least 20 mol % or more of the total siloxane units. Herein, R represents a monovalent organic group, a hydroxyl group or an alkoxy group, and is preferably selected from curing reactive groups with a carbon-carbon double bond described below, monovalent hydrocarbon groups with 1 to 10 carbon atoms without a carbon-carbon double bond, hydroxyl groups, or alkoxy groups with 1 to 10 carbon atoms.
- The curing reactive group having a carbon-carbon double bond may be a functional group having a carbon-carbon double bond such as a (meth)acryloxy group or the like, but is particularly preferably a hydrosilylation reactive functional group. Such a functional group can form a cured product when component (C) described later is a curing agent that is an organohydrogenpolysiloxane and a hydrosilylation reaction catalyst. Examples of such a curing reactive group include alkenyl groups with 2 to 10 carbons, and is particularly preferably a vinyl group or 1-hexenyl group.
- Preferably, the amount of alkenyl groups in component (A1) is 1 to 50 mol %, preferably 2 to 45 mol %, and more preferably 2 to 35 mol % of all silicon-bonded organic groups. By setting the amount of alkenyl groups in component (A1) within the range above, relatively high hardness can be imparted to a resulting cured product even when the raw material ratio of component (A1) in the present composition is small.
- Component (A1) may contain other functional groups that do not have a carbon-carbon double bond, and in particular, preferably contains a monovalent hydrocarbon group with 1 to 10 carbon atoms that does not have a carbon-carbon double bond, and particularly preferably contains an alkyl group with 1 to 10 carbon atoms such as a methyl group or the like. On the other hand, if a transparent composition is desired, component (A1) has a percentage of phenyl groups and other aryl groups in the total silicon-bonded organic groups within a range of 0 to 5 mol %, more preferably within a range of 0 to 2 mol %, and most preferably does not contain aryl groups (=0 mol %).
- Preferably, the functional group bonded to the silicon atom in component (A1) is a group selected from methyl groups, vinyl groups and other alkenyl groups, and 50 to 99 mol % of all silicon-bonded organic groups are preferably methyl groups, 55 to 98 mol % of all organic groups bonded to silicon atoms are more preferably methyl groups, and 65 to 98 mol % of all silicon-bonded organic groups are particularly preferably methyl groups, with any other functional group bonded to a silicon atom being a vinyl group or other alkenyl group. In such a range, component (A1) has higher mutual solubility with other components, and coloring resistance and the like of a resulting cured product at high temperatures is improved. Note that a small amount of hydroxyl groups or alkoxy groups may be included in component (A1).
- Component (A1) contains a siloxane unit expressed by RSiO3/2 or R4/2, which are branch units, making up at least 20 mol % or more of the total siloxane units, preferably the RSiO3/2 or R4/2, which are branch units, make up least 40 mol % or more of the total siloxane units, more preferably 50 mol % or more, and particularly preferably they are within a range of 50 to 90 mol %. Note that R preferably represents a monovalent organic group, and particularly preferably a methyl group from the perspective of compatibility with other components.
- Preferably, component (A1) is
-
- (A1-1) an organopolysiloxane resin expressed by the following average unit formula:
-
(R1 3SiO1/2)a(R1 2SiO2/2)b(R1SiO3/2)c(SiO4/2)d(R2O1/2)e - (where each R1 independently represents a monovalent hydrocarbon group with 1 to 10 carbon atoms, but 1 to 50 mol % of all R1s in a molecule represents an alkenyl group; each R2 represents a hydrogen atom or an alkyl group with 1 to 10 carbon atoms; and a, b, c, d, and e represent numbers that satisfy 0.10≤a≤0.90, 0≤b≤0.70, 0≤c≤0.80, 0≤d≤0.65, 0≤e≤0.05, but c+d>0.20 and a+b+c+d=1).
- In the aforementioned average unit formula, each R1 independently represents a monovalent hydrocarbon group having 1 to 10 carbon atoms, such as groups selected from a group consisting of: methyl groups and other alkyl groups with 1 to 10 carbon atoms, particularly preferably methyl groups; vinyl groups and other alkenyl groups with 2 to 10 carbon atoms; phenyl groups and other aryl groups; and benzyl groups and other aralkyl groups. Furthermore, 2 to 45 mol % of all R1s in one molecule are alkenyl groups, and 2 to 35 mol % of all R1s in one molecule are preferably alkenyl groups, and particularly preferably vinyl groups and/or 1-hexenyl groups. If the alkenyl group content is less than the lower limit of the range described above, the mechanical strength (hardness, and the like) of the resulting cured product may be insufficient. On the other hand, if the amount of alkenyl groups is at or below the upper limit of the range above, a composition containing the present component can form a cured product with excellent mechanical strength. Note that each R1 preferably represents a functional group selected from the alkyl groups and alkenyl groups above, but from the perspective of the technical effect of the present invention, the R1 preferably does not substantially contain a phenyl group or other aryl group.
- In the formula above, R2 represents a hydrogen atom or an alkyl group having or 1 to 10 carbon atoms. The group R2O1/2 containing the R2 corresponds to a hydroxyl group or alkoxy group of the organopolysiloxane resin of component (A1).
- In the formula, “a” represents a number indicating the percentage of siloxane units in the general formula: R1 3SiO1/2. “a” satisfies 0.1≤a≤0.90, and preferably satisfies 0.15≤a≤0.85. If “a” is within the range above, a composition containing the present component can form a cured product with excellent mechanical strength.
- In the formula, “b” represents a number indicating the percentage of siloxane units in the general formula: R1 2SiO2/2. “b” satisfies 0≤b≤0.70, and preferably satisfies 0≤b≤0.60. If “b” is at or below the upper limit of the range above, it is possible to obtain a composition in which the viscosity of the composition containing the present component does not become too high.
- In the formula, “c” represents a number indicating the percentage of siloxane units in the general formula: R3SiO3/2. “c” satisfies 0≤c≤0.80, and preferably satisfies 0≤c≤0.75. If “c” is at or below the upper limit of the range above, it is possible to obtain a composition in which the viscosity of the composition containing the present component does not become too high and the mechanical strength of a resulting cured product is excellent. In the present invention, “c” may be 0 and is preferably 0.
- In the formula above, “d” represents a number indicating the percentage of siloxane units with the formula SiO4/2, and must satisfy the condition 0.00≤d≤0.65, preferably satisfies 0.15≤d≤0.65, and particularly preferably satisfies 0.20≤d≤0.65. If “d” is within the numerical value range above, it is possible to obtain a composition in which the viscosity of the composition containing the present component does not become too high and the mechanical strength of a resulting cured product is excellent.
- In the present invention, “c” or “d” in the aforementioned formula may be 0, but must satisfy c+d>0.20. If the value of c+d is 0.20 or less, the hardness of a resulting cured product cannot be increased, and a technical effect of the present invention may not be sufficiently achieved.
- In the formula above, “e” is a number indicating the percentage of units in the general formula: R2O1/2, where the units are a hydroxyl group or alkoxy group bonded to a silicon atom that can be contained in the organopolysiloxane resin. “e” satisfies 0≤e≤0.05, preferably 0≤e≤0.03. Note that in the formula above, the sum of “a”, “b”, “c” and “d”, which is the sum of each siloxane unit, is equal to 1.
- Component (A1) is an organopolysiloxane resin having the characteristics above, which may be liquid or solid at room temperature, but whose weight average molecular weight (Mw) as measured by gel permeation chromatography (GPC) using toluene as a solvent is 15,000 or less, more preferably 10,000 or less, and particularly preferably within a range of 100 to 10,000. The viscosity of the overall composition can be reduced by using component (A1) of a relatively low molecular weight.
- The added amount of component (A1) must be within a range of 1 to 50 mass % of the total amount (100 mass %) of components (A1), (A2), and (B). The range is preferably 1 to 45 mass %, and more preferably 1 to 40 mass %. By setting the amount of component (A1) added in this range, it is possible to balance the adhesive properties, mechanical strength, and hardness of the cured product obtained from the composition of the present invention. In particular, when the molecular weight and amount of alkenyl groups of component (A1) are within the preferred range above, the overall viscosity of the composition and the amount of component (A1) added can be controlled and the relative added amount of component (A2) can be increased, which further improves the adhesion and mechanical strength, which is represented by the hardness of the cured product.
- Component (A2) is one of the main agents of the present composition and is an organopolysiloxane resin having a curing reactive functional group with a carbon-carbon double bond included in a molecule, and containing a siloxane unit expressed by SiO4/2 making up at least 20 mol % or more of the total siloxane units. By using component (A2) in combination with component (A1) and component (B) within a prescribed quantitative range, it is possible to achieve a low viscosity for the curable silicone composition as a whole and to achieve excellent adhesive properties and mechanical strength of a cured product obtained by curing the curable silicone composition. Furthermore, the hardness of the resulting curable silicone composition after curing can be adjusted by using it in combination with component (A1) having a curing reactive functional group.
- Component (A2) does not contain a curing reactive functional group containing a carbon-carbon double bond such as an alkenyl group or the like in a molecule, while preferably containing a monovalent hydrocarbon group with 1 to 10 carbon atoms without a carbon-carbon double bond, and particularly preferably a functional group selected from methyl groups and other alkyl groups with 1 to 10 carbon atoms, and aryl groups. On the other hand, component (A2) preferably has a percentage of phenyl groups and other aryl groups in the total silicon-bonded organic groups within a range of 0 to 5 mol %, more preferably within a range of 0 to 2 mol %, and most preferably does not contain aryl groups (=0 mol %). If the amount of aryl groups in component (A2) exceeds the upper limit above, component (A2) becomes hot-meltable, making it difficult to obtain a desired liquid composition, a reinforcing effect of a cured product derived from siloxane units expressed by SiO4/2 in a molecule may decrease, and the coloring resistance of the cured product under high temperature may deteriorate.
- Preferably, 70 to 100 mol % of the silicon-bonded organic groups in component (A2) are preferably methyl groups, 80 to 100 mol % are more preferably methyl groups, and 88 to 100 mol % are particularly preferably methyl groups. In such a range, component (A2) can be a component that has a particularly excellent reinforcing effect for cured products containing siloxane units expressed by SiO4/2. Note that the organopolysiloxane resin of component (A2) may contain a small amount of hydroxyl groups or alkoxy groups.
- Component (A2) is an organopolysiloxane resin and contains a siloxane unit that is a branched siloxane unit expressed by SiO4/2 making up at least 20 mol % or more of the total siloxane units in the molecule. Preferably, the SiO4/2 unit of the organopolysiloxane of component (A2) is at least 40 mol %, more preferably 50 mol % or more, and particularly preferably within a range of 50 to 65 mol % of all siloxane units.
- Preferably component (A2) is (A2-1) an organopolysiloxane resin expressed by the following average unit formula:
-
(R3 3SiO1/2)f(R3 2SiO2/2)g(R3SiO3/2)h(SiO4/2)i(R2O1/2)j - (where each R3 independently represents a monovalent hydrocarbon group with 1 to 10 carbon atoms and that does not contain a carbon-carbon double bond; R2 represents a hydrogen atom with an alkyl group with 1 to 10 carbon atoms; and f, g, h, i, and j represents numbers that satisfy 0.35≤f≤0.55, 0≤g≤0.20, 0≤h≤0.20, 0.30≤i≤0.65, 0≤j≤0.05, and f+g+h+i=1).
- In the average unit formula above, R2 represents the same group as above, and is preferably a hydrogen atom or a methyl group. R3 independently represents a monovalent hydrocarbon group having 1 to 10 carbon atoms and containing no carbon-carbon double bond, such as a methyl group or other alkyl group. Herein, it is particularly preferred from the perspective of industrial production and the technical effect of the invention that 70 mol % or more, and more preferably 88 mol % or more of the total R3 in one molecule is a methyl group or other alkyl group with 1 to 10 carbon atoms, and particularly a methyl group. On the other hand, R3 is preferably substantially free of phenyl groups and other aryl groups.
- In the formula, “f” represents a number indicating the percentage of siloxane units in the general formula: R3 3SiO1/2. “f” satisfies 0.35≤f≤0.55, and preferably 0.40≤f≤0.50. If “f” is within the range above, a cured product made of the curable silicone composition containing the present component can be provided with excellent adhesive properties and mechanical strength.
- In the formula, “g” represents a number indicating the percentage of siloxane units in the general formula: R1 2SiO2/2. “g” satisfies 0≤g≤0.20, and preferably 0≤g≤0.10. If “g” is at or below the upper limit of the range, the viscosity of the curable silicone composition containing the present component does not become too high. In the present invention, “g” may be 0 and is preferably 0.
- In the formula, “h” represents a number indicating the percentage of siloxane units in the general formula: R1SiO3/2. “h” satisfies 0≤h≤0.20, and preferably 0≤h≤0.10. If “h” is at or below the upper limit of the range, the viscosity of the curable silicone composition containing the present component does not become too high and a resulting cured product can be provided with excellent mechanical strength. In the present invention, “h” may be 0 and is preferably 0.
- In the formula above, “i” represents a number indicating the percentage of SiO4/2 siloxane units, and preferably satisfies 0.30≤i≤0.65, and particularly preferably satisfies 0.50≤i≤0.65. If “i” is within the numerical value range, a cured product obtained by curing the curable silicone composition containing the present component can be provided with excellent adhesion and mechanical strength.
- In the formula above, “i” is a number indicating the percentage of units of the general formula: R2O1/2, where the units are a hydroxyl group or alkoxy group bonded to a silicon atom that can be contained in the organopolysiloxane resin. “j” satisfies 0≤j≤0.05, preferably 0≤j≤0.03. Note that in the formula above, the sum of “f”, “g”, “h” and “i”, which is the sum of each siloxane unit, is equal to 1.
- Component (A2) is an organopolysiloxane resin having the characteristics above, which may be liquid or solid at room temperature, but whose weight average molecular weight (Mw) as measured by GPC using toluene as a solvent is preferably 15,000 or more, and particularly preferably within a range of 15,000 to 100,000, from the perspective of being able to provide a cured product containing the present composition with excellent adhesive properties and mechanical strength.
- The added amount of component (A2) is within a range of 20 to 70 mass %, and preferably 25 to 60 mass % of the total amount (100 mass %) of components (A1), (A2), and (B).
- Furthermore, in terms of balancing the properties of the overall composition of the present invention, a design technique is preferred in which component (A2) has a relatively high molecular weight and is added in a large amount relative to the total amount of components (A1), (A2), and (B) to provide a resulting cured product with excellent adhesive properties and mechanical strength, while adding a small amount of component (A1), which has a relatively low molecular weight and contains a large amount of curing reactive groups, to reduce the viscosity of the overall composition and increase the hardness and the like of a resulting cured product.
- Component (B) is one of the main agents of the present curable silicone composition, and is a linear organopolysiloxane that is liquid at 25° C. and has a curing reactive functional group containing at least two carbon-carbon double bonds in a molecule. Such a curing reactive chain organopolysiloxane can be used in combination with the aforementioned component (A1) or component (A2), which are organopolysiloxane resins, to provide mechanical strength to a resulting cured product.
- Component (B) must have a curing reactive functional group having a carbon-carbon double bond in a molecule. Such a curing reactive functional group is hydrosilylation reactive, and forms a cured product by a cross-linking reaction with another component. Such a curing reactive functional group is preferably an alkenyl group similar to that provided by component (A1), and particularly preferably a vinyl group or hexenyl group.
- Component (B) is a linear organopolysiloxane that is liquid at 25° C. (room temperature) and plays an important role in reducing the viscosity of the composition of the present invention. The chemical structure of the organopolysiloxane of component (B) is preferably
-
- (B1) a linear diorganopolysiloxane expressed by
the following structural formula (B1):
- (B1) a linear diorganopolysiloxane expressed by
-
R4 3SiO(SiR4 2O)kSiR4 3 -
- (where each R4 independently represents a monovalent hydrocarbon group with 1 to 10 carbon atoms, but at least two of the R4s in one molecule represents an alkenyl group, and k represents a number from 20 to 1,000).
A linear diorganopolysiloxane having an alkenyl group, and particularly preferably a vinyl group at both ends of a molecular chain is preferred.
- (where each R4 independently represents a monovalent hydrocarbon group with 1 to 10 carbon atoms, but at least two of the R4s in one molecule represents an alkenyl group, and k represents a number from 20 to 1,000).
- In the formula above, each R4 independently represents a monovalent hydrocarbon group having 1 to 10 carbon atoms, such as groups selected from a group consisting of: methyl and other alkyl groups, and particularly preferably methyl groups; vinyl and other alkenyl groups, and particularly preferably vinyl groups and/or hexenyl groups; phenyl and other aryl groups; and benzyl and other aralkyl groups. Furthermore, at least two of the R4 in one molecule are alkenyl groups, and preferably a vinyl group. Furthermore, each R4 is preferably a functional group selected from a group consisting of methyl groups and other alkyl groups having 1 to 10 carbon atoms and vinyl groups, hexenyl groups and other alkenyl groups, and it is preferable that of all R4s, at least two are alkenyl groups per molecule, and the remaining R4 are methyl groups. Note that from the perspective of a technical effect of the invention, R4 is preferably substantially free of phenyl groups and other aryl groups. If a large amount of phenyl groups or other aryl groups are included, the coloring resistance at high temperatures of the cured product obtained from the curable silicone composition may deteriorate. Particularly preferably, a vinyl group or other alkenyl group is preferred at both ends of a molecular chain, with the rest of R4 being a methyl group.
- In the formula above, k represents a number between 20 and 1,000 preferably between 30 and 800, and particularly preferably between 30 and 500. If k is at or above the lower limit of the above range, a resulting cured product can be provided with sufficient mechanical properties. On the other hand, if k is at or below the upper limit of the range above, an increase in the viscosity of the overall curable silicone composition can be suppressed.
- Herein, the added amount of component (B) is within a range of 15 to 70 mass %, preferably 20 to 65 mass %, and more preferably 20 to 60 mass % of the total amount (100 mass %) of components (A1), (A2), and (B). By setting the added amount of component (B) to be in this range, it is possible to balance the viscosity of the composition of the present invention and the mechanical strength and hardness of a resulting cured product.
- Component (C) is a curing agent for curing component (A1) and component (B) described above, and is specifically one or more curing agent selected from (c1) or (c2) below. Two or more of these curing agents may be used in combination, for example, the cure system may include both a (c1) component and a (c2) component.
-
- (c1) an organic peroxide; and
- (c2) an organohydrogenpolysiloxane having at least two silicon atom-bonded hydrogen atoms per molecule and a hydrosilylation reaction catalyst; and
- (c1) Organic peroxide is a component that cures component (A) and component (B) described above by heating, and examples include alkyl peroxides, diacyl peroxides, ester peroxides, and carbonate peroxides. component (c1) can also react with some of the (A2) components. Furthermore, the organic peroxide preferably has a 10-hour half-life temperature of 90° C. or higher or 95° C. or higher. Examples of such organic peroxide include dicumyl peroxide, di-tert-butyl peroxide, di-tert-hexyl peroxide, tert-butylcumyl peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 1,3-bis(tert-butylperoxyisopropyl)benzene, di-(2-tert-butylperoxyisopropyl)benzene, and 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxonan.
- While not limited thereto, the amount of the organic peroxide (c1) is preferably within a range of 0.05 to 10 mass parts, or within the range of 0.10 to 5.0 mass parts, relative to the total (100 mass parts) of component (A1), component (A2), and component (B).
- The organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in the (c2) molecule and the hydrosilylation reaction catalyst are components that cure the composition by an addition reaction (hydrosilylation reaction) of the organohydrogenpolysiloxane, which is a crosslinking agent, with the carbon-carbon double bond in component (A1) and component (B) in the presence of the hydrosilylation reaction catalyst.
- The structure of the crosslinking agent, organohydrogenpolysiloxane, is not particularly limited and may be straight-chain, branched-chain, cyclic, or resinous. In other words, component (c2) may be an organohydrogenpolysiloxane having, as a main constituent unit, a hydrogen organosiloxy unit expressed by HR2SiO1/2 (DH unit, where R independently represents a monovalent organic group), and at the end thereof a hydrogendiorganosiloxy unit expressed by HR2SiO1/2 (MH unit, where R independently represents a monovalent organic group). In particular, in the case of applications other than the molding process described below, even if the curable silicone composition is a chain-like organohydrogenpolysiloxanes made up of the DH units described above, or the like, sufficient curing is possible for practical use.
- On the other hand, when the curable silicone composition is used in a molding process, since the amount of the curing reactive functional group containing a carbon-carbon double bond in the present composition is small, from the perspective of curing rate, moldability, and curing curability thereof, the organohydrogenpolysiloxane is preferably an organohydrogenpolysiloxane resin containing a monoorganosiloxy unit expressed by RSIO3/2 (T unit, where R represents a monovalent organic group or a silicon-bonded hydrogen atom) or a branch unit of a siloxy unit (Q unit) expressed by SiO4/2, having at least two hydrogendiorganosiloxy units expressed by HR2SiO1/2 (MH unit, where R independently represents a monovalent organic group), and having the MH unit at a molecular terminal.
- A particularly preferred organohydrogenpolysiloxane is an organohydrogenpolysiloxane resin expressed by the following average unit formula:
-
(R5 3SiO1/2)l(R6 2SiO2/2)m(R6SiO3/2)n(SiO4/2)p(R2O1/2)q - In the formula, each R5 is the same or different hydrogen atom or monovalent hydrocarbon group having 1 to 10 carbon atoms without an aliphatic unsaturated carbon bond, where at least two R5 in one molecule are hydrogen atoms. A monovalent hydrocarbon group corresponding to R5, excluding hydrogen atoms, includes, for example: methyl and other alkyl groups; phenyl and other aryl groups; benzyl and other aralkyl groups; other halogenated alkyl groups; and the like. From an industrial viewpoint, methyl groups or phenyl groups are preferred.
- In the formula, R6 represents a monovalent hydrocarbon group with 1 to 10 carbon atoms without an aliphatic unsaturated carbon bond, and examples include the same groups as the monovalent hydrocarbon group described above. On the other hand, R2 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, for example, R2 in the above component (A1) or component (A2).
- In the formula, l, m, n, and p are numbers that satisfy the following: 0.1≤l≤0.80, 0≤m≤0.5, 0≤n≤0.8, 0≤p≤0.6, 0≤q≤0.05, wherein n+p>0.1 and l+m+n+p=1. Herein, when the present composition is used in the molding process, the organohydrogenpolysiloxane resin serving as a part of component (d2) is specifically preferably a MHMT resin, MHMTTH resin, MHMTQ resin, MHMQ resin, MHMTTHQ, or MHQ resin.
- A particularly preferably organohydrogenpolysiloxane serving as a part of component (c2) is an MHQ resin expressed by:
-
(H(CH3)2SiO1/2)I1(SiO4/2)p1 - Here, I1+p1=1, and it is preferable to have 0.1≤I1≤0.80 and 0.20≤p1≤0.90.
- Similarly, the organohydrogenpolysiloxane that is part of component (c2) may include straight-chain diorganopolyoxane, organohydrogenpolysiloxane, or diorganopolysiloxane whose molecular chain ends are capped by silicon-bonded hydrogen atoms or trimethylsiloxy groups. The degree of polymerization of siloxane of these straight-chain organohydrogenpolysiloxanes is not particularly limited, but is in the range of 2 to 200, and is preferably in the range of 5 to 100.
- The amount of the organohydrogenpolysiloxane, which is a part of component (c2), is an amount sufficient to cure the curable silicone composition of the present invention, and the molar ratio of the silicon-bonded hydrogen atom in the organohydrogenpolysiloxane is 0.9 or more and preferably in the range of 0.9 to 2.0 relative to the curing reactive functional group (for example, a vinyl group or other alkenyl group) containing a carbon-carbon double bond in component (A1) and component (B).
- Examples of the hydrosilylation reaction catalyst serving as a part of component (c2) include platinum-based catalysts, rhodium-based catalysts, and palladium-based catalysts. Platinum-based catalysts are preferred due to the ability to remarkably promote curing of the present composition. Exemplary platinum-based catalysts include platinum fine powder, chloroplatinic acid, an alcohol solution of chloroplatinic acid, a platinum-alkenyl siloxane complex, a platinum-olefin complex, a platinum-carbonyl complex, and a catalyst in which these platinum-based catalysts are dispersed or encapsulated with a thermoplastic resin such as silicone resin, polycarbonate resin, acrylic resin, or the like, with a platinum-alkenyl siloxane complex particularly preferable. In particular, a 1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex of platinum is preferred, and is preferably added in the form of an alkenylsiloxane solution of the complex. In addition, in terms of improving the handleability as well as the pot life of the composition, a platinum containing hydrosilylation reaction catalyst in microparticles dispersed and encapsulated with thermoplastic resin may be used. As the catalyst for promoting the hydrosilylation reaction, a non-platinum based metal catalyst such as iron, ruthenium, iron/cobalt, or the like may be used.
- On the other hand, the hydrosilylation reaction catalyst serving as a part of component (c2) may be a hydrosilylation reaction catalyst (component (c2-1)) which does not exhibit activity without irradiation with the high energy beam below, but exhibits activity in the composition by irradiation with a high energy beam. Component (c2-1) is a so-called high energy beam activated catalyst or photoactivated catalyst, which is known in the present technical field. By using component (c2-1), the composition as a whole can be cured even at low temperatures by irradiation with a high energy beam, has excellent storage stability, and facilitates reaction control, and thus the properties of excellent handling workability can be achieved.
- Examples of high energy beams include ultraviolet rays, gamma rays, X-rays, alpha rays, electron beams, and the like. In particular, examples include ultraviolet rays, X-rays, and electron beams irradiated from a commercially available electron beam irradiating device. Of these, ultraviolet rays are preferable from the perspective of efficiency of catalyst activation, and ultraviolet rays within a wavelength range of 280 to 380 nm are preferable from the perspective of industrial use. Furthermore, the amount of irradiation varies depending on the type of high energy beam activated catalyst, but in the case of ultraviolet rays, the integrated amount of irradiation at a wavelength of 365 nm is preferably within a range of 100 mJ/cm2 to 100 J/cm2.
- Specific examples of component (c2-1) include (methylcyclopentadienyl) trimethyl platinum (IV), (cyclopentadienyl) trimethyl platinum (IV), (1,2,3,4,5-pentamethyl cyclopentadienyl) trimethyl platinum (IV), (cyclopentadienyl) dimethylethyl platinum (IV), (cyclopentadienyl) dimethylacetyl platinum (IV), (trimethylsilyl cyclopentadienyl) trimethyl platinum (IV), (methoxycarbonyl cyclopentadienyl) trimethyl platinum (IV), (dimethylsilyl cyclopentadienyl) trimethylcyclopentadienyl platinum (IV), trimethyl (acetylacetonato) platinum (IV), trimethyl (3,5-heptanedionate) platinum (IV), trimethyl (methylacetoacetate) platinum (IV), bis(2,4-pentanedionato) platinum (II), bis(2,4-hexanedionato) platinum (II), bis(2,4-heptanedionato) platinum (II), bis(3,5-heptanedionato) platinum (II), bis(1-phenyl-1,3-butanedionato) platinum (II), bis(1,3-diphenyl-1,3-propanedionato) platinum (II), and bis(hexafluoroacetylacetonato) platinum (II). Of these, (methylcyclopentadienyl) trimethyl platinum (IV) and bis(2,4-pentanedionato) platinum (II) are preferred from the perspective of versatility and ease of acquisition.
- The amount of the hydrosilylation reaction catalyst, which is a part of component (c2), is preferably an amount in which a metal atom is within a range of 0.01 to 500 ppm, an amount within a range of 0.01 to 100 ppm, or an amount within a range of 0.01 to 50 ppm in terms of mass units relative to the entire composition.
- Particularly preferred components (c2) include at least an organohydrogenpolysiloxane resin expressed by the average unit formula described above and a hydrosilylation reaction catalyst.
- The curable silicone composition of the present invention may further contain (D) functional filler in addition to components (A1) to (C) above, if imparting functionality to a resulting cured product is desired.
- The functional filler, which is component (D), is a component that imparts mechanical or other properties to the cured product, and examples include inorganic fillers, organic fillers, and mixtures thereof. Examples of the inorganic fillers include a reinforcing filler, a white pigment, a thermally conductive filler, an electrically conductive filler, a phosphor, and mixtures of at least two of these, and examples of organic fillers include a silicone resin filler, a fluorine resin filler, and a polybutadiene resin filler. The shape of these fillers is not particularly limited and may be spherical, spindle-shaped, flat, needle-shaped, amorphous, or the like.
- When the present composition is used in applications as a sealing agent, a protective agent, an adhesive, and the like, a reinforcing filler can be included in at least a part of component (D) from the perspective of improving the mechanical strength, protection, and adhesion of the cured product.
- Reinforcing fillers may be added to improve the mechanical strength of the cured product, to improve protection and adhesion, and to maintain a solid particle shape as a binder filler in the curable silicone composition before curing. Examples of this type of reinforcing filler include fumed silica, precipitated silica, fused silica, calcined silica, fumed titanium dioxide, quartz, calcium carbonate, diatomaceous earth, aluminum oxide, aluminum hydroxide, zinc oxide, and zinc carbonate. These reinforcing fillers may also be surface treated with: organoalkoxysilanes such as methyltrimethoxysilane; organohalosilanes such as trimethylchlorosilane; organosilazanes such as hexamethyldisilazane; siloxane oligomers such as dimethylsiloxane oligomers capped with α,ω-silanol groups, methylphenylsiloxane oligomers capped with α,ω-silanol groups, methylvinylsiloxane oligomers capped with α-ω-silanol groups, or the like. The particle size of the reinforcing filler is not restricted, but the median diameter measured by a laser diffraction scattering type particle size distribution measurement is preferably within a range of 1 nm to 500 μm. Further, as the reinforcing filler, a fibrous filler such as calcium metasilicate, potassium titanate, magnesium sulfate, sepiolite, zonolite, aluminum borate, rock wool, glass fiber, or the like may be used.
- Further, a white pigment, a thermally conductive filler, an electrically conductive filler, or a phosphor may be blended for the purpose of imparting other functions to the cured product obtained using the composition. Organic fillers such as silicone microparticles or the like may also be blended for the purpose of improving the stress relief properties of the cured product and the like.
- The white pigment is a component that imparts whiteness to the cured product and improves light reflectivity, and the cured product obtained by curing the present composition by blending the component can be used as a light reflective material for light emitting/optical devices. Examples of the white pigment include metal oxides such as titanium oxide, aluminum oxide, zinc oxide, zirconium oxide, magnesium oxide, and the like; hollow fillers such as glass balloons, glass beads, and the like; and additionally, barium sulfate, zinc sulfate, barium titanate, aluminum nitride, boron nitride, and antimony oxide. Titanium oxide has high optical reflectivity and concealing properties, and is therefore preferable. Furthermore, aluminum oxide, zinc oxide, and barium titanate have high optical reflectivity of a UV region, and are therefore preferable. The average particle size or shape of the white pigment is not restricted, but the average particle diameter is within a range of 0.05 to 10.0 μm and preferably within a range of 0.1 to 5.0 μm. Furthermore, surface treatment of the white pigment can be performed using a silane coupling agent, silica, aluminum oxide, and the like.
- A thermally conductive filler or an electrically conductive filler is added to the cured product for the purpose of imparting thermal conductivity/electrical conductivity thereto, and specific examples include: a metallic fine powder such as gold, silver, nickel, copper, or aluminum; a fine powder such as ceramic, glass, quartz or organic resin, the surface thereof on which a metal such as gold, silver, nickel, or copper is deposited or plated; a metallic compound such as aluminum oxide, magnesium oxide, aluminum nitride, boron nitride or zinc oxide or the like; and graphite, and mixtures of two or more of these. When electrical insulation is required for the present composition, a metal oxide-based powder or a metal nitride-based powder is preferable, and in particular, an aluminum oxide powder, a zinc oxide powder, or an aluminum nitride powder is preferable and combinations of type, particle diameter, and particle shape and the like can be used according to these thermal conductivity/electrical conductivity requirements.
- Phosphor is a component that is blended to convert the emission wavelength from a light source (optical semiconductor device) when the cured product is used as a wavelength conversion material. There are no particular limitations to this phosphor, with examples thereof including yellow, red, green, and blue light phosphors, which include oxide phosphors, oxynitride phosphors, nitride phosphors, sulfide phosphors, oxysulfide phosphors, and the like, that are widely used in light emitting diodes (LED).
- Silicone microparticles include non-reactive silicone resin microparticles and silicone elastomer microparticles, but silicone elastomer microparticles are suitably exemplified from the viewpoint of improving cured product flexibility or stress relief properties.
- For the purpose of stably blending the functional filler above in the present composition and the like, the filler surface may be treated using a specific surface treatment agent within a range of 0.1 to 2.0 mass %, 0.1 to 1.0 mass %, or 0.2 to 0.8 mass % of the total mass of component (D). Examples of these surface treatment agents include, methylhydrogen polysiloxane, silicone resins, metal soaps, silane coupling agents, perfluoroalkyl silanes, as well as fluorine compounds such as perfluoroalkyl phosphate ester salts.
- The amount of component (D) is not limited, but the amount is preferably within a range of 1 to 2,000 mass parts, within a range of 1 to 1,500 mass parts, or within a range of 1 to 1,000 mass parts relative to the sum (100 mass parts) of components (A1) to (C) from the perspective of excellent hardness and mechanical strength of a resulting cured product.
- In addition to components (A) to (D) above, the curable silicone composition of the present invention may further contain a curing retarder. The type of the curing retarder is not particularly limited, and examples include: 2-methyl-3-butyne-2-ol, 3,5-dimethyl-1-hexyne-3-ol, 2-phenyl-3-butyne-2-ol, 1-ethynyl-1-cyclohexanol, and other alkyne alcohols; 3-methyl-3-pentene-1-yne, 3,5-dimethyl-3-hexene-1-yne, and other enyne compounds; tetramethyltetravinylcyclotetrasiloxane, tetramethyltetrahexenylcyclotetrasiloxane, and other alkenyl group-containing low molecular weight siloxanes; and methyl tris(1,1-dimethyl propynyloxy)silane, vinyl tris(1,1-dimethyl propynyloxy)silane, and other alkynyloxysilanes. Of these, compounds with a boiling point of 200° C. or higher under atmospheric pressure are particularly preferably used. The amount of the curing retarder in the curable silicone composition is not particularly limited, but is preferably within a range of 10 to 10,000 ppm in mass units, with regard to the composition.
- In addition to the component described above, a material conventionally known in the field may be added to the curable silicone composition of the present invention as an additive that may be used in a silicone composition, and examples of additives that may be used include, but are not limited to, those described below.
- The composition of the present invention may contain an adhesion imparting agent so long as the object of the present invention is not impaired. Such adhesion imparting agents are common to components suitably exemplified by the present applicant in the international patent application (PCT/JP2020/12027), and reaction mixtures of epoxy group-containing organoalkoxysilane and amino group-containing organoalkoxysilane disclosed in Japanese Unexamined Patent Application S52-8854 and Japanese Unexamined Patent Application H10-195085, and particularly carbasilatrane derivatives having a silicon-bonded alkoxy group or silicon-bonded alkenyl group in a molecule, silatrane derivatives having an alkoxysilyl group-containing organic group, and the like can be preferably used in addition to 3-glycidoxypropyltrimethoxysilane and other silane compounds, organosiloxane oligomers, and alkyl silicates.
- Furthermore, the composition may contain, as other optional components, heat resistance agents such as iron oxide (red iron oxide), cerium oxide, cerium dimethyl silanolate, fatty acid cerium salt, cerium hydroxide, zirconium compound, and the like, with dyes, pigments other than white, flame retardant agents, and the like capable of being contained as long as the purpose of the present invention is not impaired.
- The curable silicone composition of the present invention is in a liquid or paste-like form, and therefore can be produced by kneading the aforementioned components (A) to (D) and an optional component by a known method. A mixing device used in mixing or kneading is not limited, and examples include uniaxial or biaxial continuous mixers, two-roll mixers, ROSS mixers, Hobart mixers, dental mixers, planetary mixers, kneader mixers, laboratory mills, small-sized grinders, and Henschel mixers, and preferably, laboratory mills or Henschel mixers.
- The curable silicone composition forms a cured product by either thermal curing, high energy beam curing, or high energy beam+thermal curing. Therefore, it is possible to form a cured product while demonstrating adhesion to a base material by applying the composition on or inside the base material to be cured by dispensing or the like prior to the curing process, followed by curing.
- The curable silicone composition of the present invention can be used as a liquid at room temperature and has excellent coloring resistance, adhesion to various base materials, and mechanical strength at high temperature of a resulting cured product obtained by curing the present composition at high temperature. Therefore, the composition is useful for applications such as sealing materials for light emitting/optical devices, light reflective materials and other semiconductor members, and optical semiconductors having the cured product. Furthermore, since the cured product has superior mechanical properties, the cured product is suitable as: an encapsulant for semiconductors; an encapsulant for power semiconductors such as SiC, GaN, or the like; and as an adhesive, potting agent, protective agent, and coating agent for electrical and electronic applications. On the other hand, since the hardness of a cured product can be freely controlled by adjusting the composition, compositions that form cured products with relatively soft and rubber elasticity can be used as a stress buffer layer (adhesive layer) between two types of base materials with different coefficients of linear expansion.
- Furthermore, the cured product containing the curable silicone composition of the present invention exhibits favorable adhesion to difficult-to-adhere base materials such as polyphenylene sulfone resin, silicone resin, fluororesin, and the like, and can therefore be used for sealing these base materials, as a stress-relief layer to adhere two different base materials, or the like. In other words, the curable silicone composition of the present invention may be a sealing agent for single-sided sealing or for double-sided sealing along with adhesion between two base materials, and have preferred properties suitable for these applications.
- As described above, the curable silicone composition of the present invention can use thermal curing, curing with high energy beams such as ultraviolet light or the like, or curing with a combination thereof, depending on the selection of component (C). In the case of thermal curing, exposure to temperatures of 100° C. or higher, and preferably 150° C. or higher, generally allows curing to rapidly advance. In the case of the high energy beam curing type, after irradiation of the light beam, curing progresses by leaving at room temperature or by heating. Therefore, it is easy to ensure stability as a liquid composition by applying to a base material before irradiating with a high energy beam. After applying to a base material, the present composition can be cured quickly at 25° C. or at low temperatures of 100° C. or lower by irradiating with a high energy beam.
- The composition of the present invention is characterized by the ability to be handled as a liquid at 25° C., and therefore, the viscosity thereof must be 50 Pa·s or less at a shear rate of 10 (1/s). 30 Pa·s or less is preferred, 10 Pa·s or less is more preferred, and a range of 0.01 to 10 Pa·s is particularly preferred. By keeping the viscosity of the composition at or below the range above, it is possible to accommodate processes that require low viscosity.
- The composition of the present invention contains curing reactive groups including carbon-carbon double bonds derived from component (A1), component (B), and other components, but in order to make the hardness of a resulting cured product in an elastomer region, the amount of curing reactive groups must be 1.5 mol % or more/100 g of the composition, and preferably 1.5 to 15.0 mol %/100 g of the composition. In particular, when the composition of the present invention is cured by a hydrosilylation reaction, the amount of alkenyl groups, which are curing reactive groups, is preferably 1.5 mol % or more per 100 g of the composition. By setting this range at or above the lower limit above, a resulting cured product can have a sufficient crosslinking density and the hardness thereof can be increased.
- The preferred hardness of the cured product obtained by curing the curable hot melt silicone composition of the present invention is preferably 20 or higher, as measured by a Type A durometer hardness specified in “Durometer Hardness Test Method for Plastics” of JIS K 7215-1986. 30 or higher is more preferred. This is because if the hardness is at or below the lower limit above, the cured product will be too soft and tacky and cannot be used for sealing a base material. On the other hand, if the application is not for sealing a substrate, but rather an adhesive layer to adhere two different base materials, the Type A durometer hardness may be near the lower limit. This is because a lower hardness causes better stress relaxation properties.
- An application of the cured product obtained by curing the curable silicone composition of the present invention is not particularly limited. The composition of the present invention can be handled as a liquid at room temperature, making it suitable for processes that require the composition to be liquid. A resulting cured product exhibits favorable adhesive properties to various base materials and has excellent mechanical strength, and the cured product has low surface tack and hardness in an elastomer region. Therefore, the cured product obtained by curing the present composition can be suitably used as a member for a semiconductor device, and can be suitably used as an encapsulant for a semiconductor element, an IC chip or the like, and as an adhesive/bonding member of a conductor device.
- Although semiconductor devices provided with a member containing a cured product obtained by curing the curable silicone composition of the present invention are not particularly limited, in particular, the composition of the present invention can form optically transparent to light reflective or light shielding cured products depending on the presence or absence of component (D), and can be used for different applications. For example, it is preferably a light emitting semiconductor device, which is a light-emitting/optical device, an optical member for a display, or a solar panel member, and particularly preferably a sealing material, case material, or adhesive member used in these devices and the like. Furthermore, the cured product of the present invention has excellent coloring resistance at high temperatures, and therefore is more preferably used as a sealing material, case material, or adhesive member used in electronic materials where transparency and light/heat resistance are important.
- The curable silicone composition of the present invention and manufacturing method thereof are described below in detail using Embodiments and comparative examples. Note that in the following description, Me, Vi, and Ph in the average unit formula represent methyl, vinyl, and phenyl groups, respectively. Furthermore, the hardness, tensile elongation, surface tack, and adhesion to polyphenylene sulfone resin of the cured product of the curable silicone composition of each embodiment and comparative example were measured by the following methods. The results are shown in Table 1.
- Note that the weight average molecular weight (Mw) of the organopolysiloxane resin in each reference example was determined using gel permeation chromatography (GPC) introduced by Waters Corporation, using toluene as a mobile solvent and based on standard polystyrene equivalent.
- The curable silicone composition was heated at 150° C. for 2 hours to form a cured product. The hardness of the cured product was measured by a type A durometer specified in JISK 7215-1986 “Durometer Hardness Testing Method for Plastics.”
- The curable silicone composition was heated at 150° C. for 2 hours to prepare a cured product. The tensile elongation rate of the cured product was measured using the method specified in JIS K 6251-2010 “Vulcanized Rubber and Thermoplastic Rubber—Determination of Tensile Properties.”
- The curable silicone composition was heated at 150° C. for 2 hours to prepare a cured product. After placing a PET film on the resulting cured product and applying a load of 50 g/cm2 for 10 seconds, the PET film was removed from the cured product. A film that peeled smoothly without adhering was rated as ◯, a film that strongly adhered and was difficult to peel off was rated as X, and a film that was between ◯ and X was rated as Δ.
- A dispenser was used to apply the curable silicone composition on a 25 mm×75 mm polyphenylene sulfone resin sheet at 5 locations using approximately 100 mg at each location. A 1 mm thick and 6 mm square aluminum chip was placed on the composition, and the assembly was pressure bonded by a 1 kg plate. The assembly was then heated at 150° C. for 2 hours to form a cured product. After cooling to room temperature, a die shear test was performed using a shear strength measuring device (Bond Tester SS-100KP manufactured by Seishin Trading Co., Ltd.), and the failure mode was visually observed to determine whether cohesive failure or interface peeling occurred.
- The following compounds were used in the Examples and Comparative Example described below.
-
- Component (a1-1): Organopolysiloxane resin (amount of vinyl groups=3.1 mol %, weight average molecular weight (Mw) as measured by GPC using toluene as a solvent of 4,300) as expressed by the average unit formula:
-
(Me2ViSiO1/2)0.08(Me3SiO1/2)0.42(SiO4/2)0.50(HO1/2)0.01 -
- Component (a1-2): Organopolysiloxane resin (amount of vinyl groups=19 mol %, weight average molecular weight (Mw) as measured by GPC using toluene as a solvent of 1,100) as expressed by the average unit formula:
-
(Me2ViSiO1/2)0.65(SiO4/2)0.35(HO1/2)0.01 -
- Component (a1-3): Organopolysiloxane resin (amount of vinyl groups=1.9 mol %, weight average molecular weight (Mw) as measured by GPC using toluene as a solvent of 18,000) as expressed by the average unit formula:
-
(Me2ViSiO1/2)0.05(Me3SiO1/2)0.39(SiO4/2)0.56(HO1/2)0.02 -
- Component (a2-1): Organopolysiloxane resin (amount of vinyl groups=0 mol %, weight average molecular weight (Mw) as measured by GPC using toluene as a solvent of 18,500) as expressed by the average unit formula:
-
(Me3SiO1/2)0.44(SiO4/2)0.56(HO1/2)0.02 -
- Component (a2-2): Organopolysiloxane resin (amount of vinyl groups=3.1 mol %, weight average molecular weight (Mw) as measured by GPC using toluene as a solvent of 4,300) as expressed by the average unit formula:
-
(Me2ViSiO1/2)0.08(Me3SiO1/2)0.42(SiO4/2)0.50HO1/2)0.01 -
- Component (b-1): Dimethylpolysiloxane blocked at both molecular terminals with dimethylvinylsiloxy groups (amount of vinyl groups=0.23 mol %) expressed by
ti ViMe2SiO(Me2SiO)300SiViMe2 - Component (b-2): Dimethylpolysiloxane blocked at both molecular terminals with dimethylvinylsiloxy groups (amount of vinyl groups=1.53 mol %) expressed by
- Component (b-1): Dimethylpolysiloxane blocked at both molecular terminals with dimethylvinylsiloxy groups (amount of vinyl groups=0.23 mol %) expressed by
-
ViMe2SiO(Me2SiO)45SiViMe2 -
- Component (b-3): Dimethylpolysiloxane blocked at both molecular terminals with dimethylvinylsiloxy groups (amount of vinyl groups=0.44 mol %) expressed by
-
ViMe2SiO(Me2SiO)140SiViMe2 -
- Component (b-4): Dimethylpolysiloxane blocked at both molecular terminals with dimethylvinylsiloxy groups (amount of vinyl groups=0.09 mol %) expressed by
-
ViMe2SiO(Me2SiO)800SiViMe2 -
- Component (c1-1): Organohydrogenpolysiloxane expressed by
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Me3SiO(Me2SiO)37(MeHSiO)37SiMe3 -
- Component (c1-2): Organohydrogenpolysiloxane expressed by
-
HMe2SiO(Me2SiO)17SiMe2H -
- Component (c1-3): Organohydrogenpolysiloxane expressed by
-
(HMe2SiO1/2)0.67(SiO4/2)0.33 -
- Component (c1-4): Organohydrogenpolysiloxane expressed by
-
Me3SiO(MeHSiO)55SiMe3 -
- Component (c2): 1,3-divinyl-1,1,3,3-tetramethyldisiloxane solution of 1,3-divinyl-1,1,3,3-tetramethyldisiloxane of platinum (at an amount where platinum metal is 5.0 ppm in terms of mass units with respect to the present composition)
- Component (d): Titanium oxide (SX-3103 manufactured by Sakai Chemical Industry Co., Ltd.) having an average primary particle diameter of 0.2 μm
- Component (e): 1-ethynylcyclohexanol (at an amount where platinum metal is 50 ppm in mass units with respect to the present composition)
- Component (f): Dimethylpolysiloxane with one end of a molecular chain blocked by a dimethylvinylsiloxy group and the other end of the molecular chain blocked by a trimethoxysiloxy group, expressed by
-
Me2ViSiO(Me2SiO)29Si(OMe)3 - Curable silicone compositions were prepared by mixing each component in the parts listed in Tables 1 and 2. The viscosity at a shear rate of 10 (1/s) at 25° C., hardness of the cured product, tensile elongation, surface tack, and adhesion to polyphenylene sulfone resin of the cured product are shown in the tables. Note that in Comparative Example 6, the composition was exposed to 150° C. for 2 hours and a hot-melt material was obtained, but no cured product was obtained. Therefore, the physical property value of the cured product was set to “NA”.
-
TABLE 1 Component Embodiment 1 Embodiment 2 Embodiment 3 a1-1 28.0 a1-2 7.0 7.0 a1-3 a2-1 29.0 40.0 40.0 a2-2 b1 11.0 43.3 47.5 b2 12.0 b3 b4 c1-1 3.0 9.7 c1-2 17.0 c1-3 5.5 c1-4 c2 (ppm) 5 5 5 d e (ppm) 50 50 50 f Viscosity (mPa) 2500 4500 6700 Hardness (Shore A) 40.0 45 42 Tensile elongation (%) 88.0 130 120 Surface tack ○ ○ ○ Adhesion Cohesive Cohesive Cohesive failure failure failure Component Embodiment 4 Embodiment 5 Embodiment 6 a1-1 11.8 30.0 30.0 a1-2 3.2 a1-3 a2-1 34.3 a2-2 28.0 28.0 b1 34.7 30.00 31.2 b2 5.1 b3 b4 c1-1 7.6 4.0 c1-2 8.0 8.00 c1-3 2.8 c1-4 c2 (ppm) 5 5 5 d 100 e (ppm) 50 50 50 f 3.3 Viscosity (mPa) 17000 2300 3500 Hardness (Shore A) 81 38 35 Tensile elongation (%) 53 75 70 Surface tack ○ Δ Δ Adhesion Cohesive Cohesive Cohesive failure failure failure -
TABLE 2 Comparative Comparative Comparative Component Example 1 Example 2 Example 3 a1-1 a1-2 a1-3 5.0 10.0 a2-1 34.1 28.9 39.3 a2-2 b1 58.6 58.3 59.0 b2 b3 b4 c1-1 c1-2 c1-3 1.5 2.1 0.97 c1-4 c2 (ppm) 5 5 5 d e (ppm) 50 50 50 f Viscosity (mPa) 3300 2450 4800 Hardness (Shore A) 18 27 12 Tensile elongation (%) 183 154 318 Surface tack × × × Adhesion Cohesive Cohesive Cohesive failure failure failure Comparative Comparative Comparative Component Example 4 Example 5 Example 6 a1-1 44.6 a1-2 a1-3 37.4 a2-1 59.1 37.4 a2-2 b1 39.4 b2 5.3 b3 44.5 b4 15.3 c1-1 6.25 c1-2 4.0 c1-3 0.69 3 c1-4 0.8 c2 (ppm) 5 5 5 d e (ppm) 50 50 50 f Viscosity (mPa) 42000 3000 Solid Hardness (Shore A) 14 80 NA Tensile elongation (%) 520 51 Surface tack × ○ Adhesion Cohesive Interfacial failure peeling - The curable silicone compositions of Embodiments 1 to 6 according to the present invention combine specific organopolysiloxane resins and chain organopolysiloxanes at specific ratios to obtain compositions with viscosities of 50 Pas or lower at 25° C., and cured products thereof were found to exhibit excellent adhesive properties and mechanical strength, and low surface tack with a hardness in an elastomer region of shore A 20 or higher.
- On the other hand, the curable silicone compositions of Comparative Examples 1 to 4 have a low concentration of curing reactive groups in the compositions, and resulting cured products are very soft and tacky on the surface, indicating that the products are not suitable in applications of sealing base materials. Furthermore, the curable silicone composition in Comparative Example 5 forms a relatively hard cured product and the surface tack thereof is low, but the adhesive properties thereof are inferior to those of the compositions in the Embodiments. Furthermore, the curable silicone composition in Comparative Example 6 was not liquid at room temperature, and no cured product was obtained even when heat was applied.
Claims (11)
1. A curable silicone composition, comprising:
(A1) an organopolysiloxane resin having a curing reactive functional group with a carbon-carbon double bond included in a molecule, and containing a siloxane unit expressed by RSiO3/2 where R represents a monovalent organic group, hydroxyl group or alkoxy group or SiO4/2 making up at least 20 mol % of all siloxane units, at an amount within a range of 1 to 50 mass % relative to the total amount of components (A1), (A2), and (B);
(A2) an organopolysiloxane resin not having a curing reactive functional group with a carbon-carbon double bond included in a molecule, and containing a siloxane unit expressed by SiO4/2 making up at least 20 mol % of all siloxane units, at an amount within a range of 20 to 70 mass % relative to the total amount of components (A1), (A2), and (B);
(B) a linear organopolysiloxane in a liquid state at 25° C., having a curing reactive functional group with at least two carbon-carbon double bonds included in a molecule, at an amount within a range of 15 to 70 mass % relative to the total amount of components (A1), (A2), and (B); and
(C) at least one curing agent for curing the composition, at an amount sufficient for curing the composition;
wherein the viscosity of the composition is 50 Pa·s or less, and the amount of curing reactive functional groups containing a carbon-carbon double bond in 100 g of the composition is 1.5 mol % or more.
2. The curable silicone composition according to claim 1 , further comprising:
(D) a functional filler in a range of 1 to 2000 mass parts when the total amount of components (A1) to (C) is 100 mass parts.
3. The curable silicone composition according to claim 1 , wherein component (A1) is (A1-1) an organopolysiloxane resin as expressed by the following average unit formula:
(R1 3SiO1/2)a(R1 2SiO2/2)b(R1SiO3/2)c(SiO4/2)d(R2O1/2)e
(R1 3SiO1/2)a(R1 2SiO2/2)b(R1SiO3/2)c(SiO4/2)d(R2O1/2)e
where each R1 independently represents a monovalent hydrocarbon group with 1 to 10 carbon atoms, but 2 to 40 mol % of all R1s in a molecule represent an alkenyl group; each R2 represents a hydrogen atom or an alkyl group with 1 to 10 carbon atoms; and a, b, c, d, and e represent numbers that satisfy 0.10≤a≤0.90, 0≤b≤0.70, 0≤c≤0.80, 0≤d≤0.65, 0≤e≤0.05, (c+d)>0.2, and (a+b+c+d)=1.
4. The curable silicone composition according to claim 1 , wherein the weight average molecular weight (Mw) of component (A1), as measured by gel permeation chromatography (GPC) using toluene as a solvent, is 15,000 or less.
5. The curable silicone composition according to claim 1 , wherein component (A2) above is (A2-1) an organopolysiloxane resin expressed by the following average unit formula:
(R3 3SiO1/2)f(R3 2SiO2/2)g(R3SiO3/2)h(SiO4/2)i(R2O1/2)j
(R3 3SiO1/2)f(R3 2SiO2/2)g(R3SiO3/2)h(SiO4/2)i(R2O1/2)j
where each R3 independently represents a monovalent hydrocarbon group with 1 to 10 carbon atoms and that does not contain a carbon-carbon double bond; R2 represents a hydrogen atom with an alkyl group with 1 to 10 carbon atoms; and f, g, h, i, and j represents numbers that satisfy 0.35≤f≤0.70, 0≤g≤0.20, 0≤h≤0.20, 0.30≤i≤0.65, 0≤j≤0.05, and (f+g+h+i)=1.
6. The curable silicone composition according to claim 1 , wherein component (B) is (B1) a linear diorganopolysiloxane expressed by the following structural formula:
R4 3SiO(SiR4 2O)kSiR4 3
R4 3SiO(SiR4 2O)kSiR4 3
where each R4 independently represents a monovalent hydrocarbon group with 1 to 10 carbon atoms, but at least two of the R4s in one molecule represents an alkenyl group, and k represents a number from 5 to 1,000.
7. The curable silicone composition according to claim 1 , wherein component (C) is an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule and a hydrosilylation reaction catalyst; and
wherein the organohydrogenpolysiloxane is included at an amount in which 0.9 to 2.0 mols of silicon-bonded hydrogen atoms is provided per 1 mol of the total amount of carbon-carbon double bonds in the composition.
8. A cured product obtained by curing the curable silicone composition according to claim 1 .
9. The cured product according to claim 8 , wherein the Shore A hardness is 20 or higher.
10. A semiconductor member, comprising the cured product according to claim 8 .
11. A semiconductor device, comprising the cured product according to claim 8 .
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JPS528854A (en) | 1975-07-11 | 1977-01-24 | Hitachi Ltd | Device for detecting oil inside a draining pit |
US5366809A (en) | 1993-09-02 | 1994-11-22 | Dow Corning Corporation | Silicone pressure-sensitive adhesives |
US5373078A (en) | 1993-10-29 | 1994-12-13 | Dow Corning Corporation | Low viscosity curable organosiloxane compositions |
JP3831481B2 (en) | 1996-11-18 | 2006-10-11 | 東レ・ダウコーニング株式会社 | Carbacyltolan derivative, method for producing the same, adhesion promoter, and curable silicone composition |
JP5680889B2 (en) | 2010-06-29 | 2015-03-04 | 東レ・ダウコーニング株式会社 | Curable organopolysiloxane composition and optical semiconductor device |
JP5534977B2 (en) | 2010-06-29 | 2014-07-02 | 東レ・ダウコーニング株式会社 | Curable organopolysiloxane composition and optical semiconductor device |
EP2953994B1 (en) * | 2013-02-11 | 2021-09-08 | Dow Silicones Corporation | Moisture-curable hot melt silicone adhesive compositions including an alkoxy-functional siloxane reactive resin |
KR20150097947A (en) | 2014-02-19 | 2015-08-27 | 다우 코닝 코포레이션 | Reactive silicone composition, hotmelt material made therefrom, and curable hotmelt composition |
JP6586555B2 (en) * | 2014-12-26 | 2019-10-09 | ダウ・東レ株式会社 | Curable silicone composition, semiconductor sealant and semiconductor device comprising the same |
CN106008979A (en) * | 2015-03-27 | 2016-10-12 | 豪雅冠得股份有限公司 | Curable resin composition and optical semiconductor device |
WO2017043328A1 (en) * | 2015-09-11 | 2017-03-16 | ケイ素材料開発株式会社 | Crosslinkable organopolysiloxane composition and cured object obtained therefrom |
JP2018172447A (en) * | 2015-09-11 | 2018-11-08 | ケイ素材料開発株式会社 | Crosslinkable organopolysiloxane composition and cured product thereof |
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JP7176827B2 (en) * | 2017-11-07 | 2022-11-22 | ダウ・東レ株式会社 | Organopolysiloxane composition |
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